I have a fairly straight forward Umbraco site (v4.9.1) which contains a number of Razor Macros. I've attempted to add an Examine Index to create a simple site search and am hitting the following problems:

• The Examine index is not created
• Razor scripts that were working are now failing

<?xml version="1.0"?>
<!-- 
Umbraco examine is an extensible indexer and search engine.
This configuration file can be extended to add your own search/index providers.
Index sets can be defined in the ExamineIndex.config if you're using the standard provider model.
More information and documentation can be found on CodePlex: http://umbracoexamine.codeplex.com
-->
<configuration>
    <configSections>
        <section name="Examine" type="Examine.Config.ExamineSettings, Examine"/>
    </configSections>
    <Examine>
        <ExamineIndexProviders>
            <providers>
                <add name="InternalIndexer" type="UmbracoExamine.UmbracoContentIndexer, UmbracoExamine"
                     supportUnpublished="true"
                     supportProtected="true"
                     interval="10"
                     analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net"/>
                <add name="InternalMemberIndexer" type="UmbracoExamine.UmbracoMemberIndexer, UmbracoExamine"
                     supportUnpublished="true"
                     supportProtected="true"
                     interval="10"
                     analyzer="Lucene.Net.Analysis.Standard.StandardAnalyzer, Lucene.Net"/>
                <!-- default external indexer, which excludes protected and published pages-->
                <add name="ExternalIndexer" type="UmbracoExamine.UmbracoContentIndexer, UmbracoExamine"
                    supportUnpublished="false"
                    supportProtected="false"
                    interval="10"
                    analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net"/>
                <add name="FrontEndIndexer" type="UmbracoExamine.UmbracoContentIndexer, UmbracoExamine"
                    supportUnpublished="false"
                    supportProtected="false"
                    interval="10"
                    analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net"/>
            </providers>
        </ExamineIndexProviders>
        <ExamineSearchProviders defaultProvider="FrontEndSearcher">
            <providers>
                <add name="InternalSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine"
                     analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net"/>
                <add name="ExternalSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine"
                       analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net" enableLeadingWildcards="true"/>
                <add name="FrontEndSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine"
                       analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net" enableLeadingWildcards="true"/>
                <add name="InternalMemberSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine"
                   analyzer="Lucene.Net.Analysis.Standard.StandardAnalyzer, Lucene.Net" enableLeadingWildcards="true"/>
            </providers>
        </ExamineSearchProviders>
    </Examine>
</configuration>

My ExamineIndex.config is as follows:

<?xml version="1.0"?>
<!-- 
Umbraco examine is an extensible indexer and search engine.
This configuration file can be extended to create your own index sets.
Index/Search providers can be defined in the UmbracoSettings.config
More information and documentation can be found on CodePlex: http://umbracoexamine.codeplex.com
-->
<configuration>
    <configSections>
        <section name="ExamineLuceneIndexSets" type="Examine.LuceneEngine.Config.IndexSets, Examine"/>
    </configSections>
    <ExamineLuceneIndexSets>
        <!-- The internal index set used by Umbraco back-office - DO NOT REMOVE -->
        <IndexSet SetName="InternalIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/Internal/">
            <IndexAttributeFields>
                <add Name="id" />
                <add Name="nodeName" />
                <add Name="updateDate" />
                <add Name="writerName" />
                <add Name="path" />
                <add Name="nodeTypeAlias" />
                <add Name="parentID" />
            </IndexAttributeFields>
            <IndexUserFields />
            <IncludeNodeTypes/>
            <ExcludeNodeTypes />
        </IndexSet>
        <IndexSet SetName="FrontEndIndexSet" IndexPath="~/App_Data/ExamineIndexes/FrontEnd/">
            <IndexAttributeFields>
                <add Name="nodeName" />
                <add Name="path" />
            </IndexAttributeFields>
                <add Name="pageTitle" />
                <add Name="pageDisplayTitle" />
                <add Name="pageSummary" />
                <add Name="mainContent" />
                <add Name="column1" />
                <add Name="column2" />
                <add Name="column3" />
                <add Name="column4" />
                <add Name="listTitle" />
                <add Name="listEntries" />
            <IndexUserFields />
            <IncludeNodeTypes>
                <add Name="HomePage" />
                <add Name="Page" />
            </IncludeNodeTypes>
            <ExcludeNodeTypes />
        </IndexSet>
        <!-- The internal index set used by Umbraco back-office for indexing members - DO NOT REMOVE -->
        <IndexSet SetName="InternalMemberIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/InternalMember/">
            <IndexAttributeFields>
                <add Name="id" />
                <add Name="nodeName"/>
                <add Name="updateDate" />
                <add Name="writerName" />
                <add Name="loginName" />
                <add Name="email" />
                <add Name="nodeTypeAlias" />
            </IndexAttributeFields>
            <IndexUserFields/>
            <IncludeNodeTypes/>
            <ExcludeNodeTypes />
        </IndexSet>
        <!-- Default Indexset for external searches, this indexes all fields on all types of nodes-->
        <IndexSet SetName="ExternalIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/External/" />
    </ExamineLuceneIndexSets>
</configuration>

And a previosly working now failing Razor Macro (HomeGallerImages.cshtml):

@using umbraco.MacroEngines
@inherits DynamicNodeContext
@if (Model.HasValue("galleryImages"))
{
    string[] ids = Model.GalleryImages.Split(',');
    <ul class="rslides">
    @foreach (string id in ids)
    {
        var node = Library.NodeById(id);
        if (node.Id != 0)
        {
            // If node exists:
            <li><img src="@node.Url" /><span>@Html.Raw(node.AltText.Replace("\n","<br />"))</span></li>
        }
    }
    </ul>
}

this fails on the line:

var node = Library.NodeById(id);

Generating the following error:

Error Loading Razor Script (file: Home Gallery Images) The type initializer for 'Examine.ExamineManager' threw an exception.    at umbraco.MacroEngines.ExamineBackedMedia.GetUmbracoMedia(Int32 id)
  at umbraco.MacroEngines.DynamicBackingItem..ctor(Int32 Id)
  at umbraco.MacroEngines.DynamicNode..ctor(String NodeId)
  at umbraco.MacroEngines.Library.RazorLibraryCore.NodeById(String Id)
  at ASP._Page_macroScripts_HomeGalleryImages_cshtml.Execute() in c:\Users\ ... \macroScripts\HomeGalleryImages.cshtml:line 10
  at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
  at System.Web.WebPages.WebPage.ExecutePageHierarchy()
  at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
  at umbraco.MacroEngines.RazorMacroEngine.ExecuteRazor(MacroModel macro, INode currentPage)
  at umbraco.MacroEngines.RazorMacroEngine.Execute(MacroModel macro, INode currentPage)

Looking at the umbracoLog table in the DB I see the following error after 'Application started' and 'Loading content from disk cache...' when the app pool is restarted:

Error loading application startup handler: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeInitializationException: The type initializer for 'Examine.ExamineManager' threw an exception. ---> System.TypeInitializationException: The type initializer for 'Examine.Config.ExamineSettings' threw an exception. ---> System.Configuration.ConfigurationErrorsException: The format of a configSource file must be an element containing the name of the section. (C:\Users\...\config\ExamineSettings.config line 9)     at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)     at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)     at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)     at System.Configuration.BaseConfigurationRecord.GetSection(String configKey)     at System.Configuration.ConfigurationManager.GetSection(String sectionName)     at Examine.Config.ExamineSettings..cctor()     --- End of inner exception stack trace ---     at Examine.ExamineManager.LoadProviders()     at Examine.ExamineManager..cctor()     --- End of inner exception stack trace ---     at umbraco.presentation.umbraco.Search.ExamineEvents..ctor()     --- End of inner exception stack trace ---     at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)     at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)     at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)     at System.Activator.CreateInstance(Type type, Boolean nonPublic)     at System.Activator.CreateInstance(Type type)     at umbraco.businesslogic.ApplicationStartupHandler..cctor()

followed by

Error loading application startup handler: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeInitializationException: The type initializer for 'Examine.ExamineManager' threw an exception. ---> System.TypeInitializationException: The type initializer for 'Examine.Config.ExamineSettings' threw an exception. ---> System.Configuration.ConfigurationErrorsException: The format of a configSource file must be an element containing the name of the section. (C:\Users\...\config\ExamineSettings.config line 9)     at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)     at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)     at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)     at System.Configuration.BaseConfigurationRecord.GetSection(String configKey)     at System.Configuration.ConfigurationManager.GetSection(String sectionName)     at Examine.Config.ExamineSettings..cctor()     --- End of inner exception stack trace ---     at Examine.ExamineManager.LoadProviders()     at Examine.ExamineManager..cctor()     --- End of inner exception stack trace ---     at UmbracoExamine.UmbracoEventManager..ctor()     --- End of inner exception stack trace ---     at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)     at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)     at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)     at System.Activator.CreateInstance(Type type, Boolean nonPublic)     at System.Activator.CreateInstance(Type type)     at umbraco.businesslogic.ApplicationStartupHandler..cctor()

Finally I don't know if this is relevent but after a publish I get the following error in the umbracoLog table immediately before the 'Xml saved in 00:00:00.00xxxxx':

Error adding to SiteMapProvider in loadNodes(): System.InvalidOperationException: Multiple nodes with the same URL '/' were found. XmlSiteMapProvider requires that sitemap nodes have unique URLs.     at System.Web.StaticSiteMapProvider.AddNode(SiteMapNode node, SiteMapNode parentNode)     at umbraco.presentation.nodeFactory.UmbracoSiteMapProvider.loadNodes(String parentId, SiteMapNode parentNode)