I'm running Umbraco 4.5.2 (.Net 2/3.5 version) as a Rackspace Cloud Site. When I delete all of my index files and restart the web application, I get an exception in the log midway through the new indexes being builts:

[UmbracoExamine] An error occurred recreating the index set,Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed., IndexSet: PublicIndexSet

A few notes:

• Rackspace Cloud Sites run under Medium Trust
• I'm using user impersonation for my site, so my site is running under the same accoun that originally created/uploaded the folder and files where the examine index lives
• The site is able to create exa and lck files in the root of my index folder "PublicIndex"
• There is a "write.lock" file in my /PublicIndex/Index folder - I think this was created before the exception was thrown, but the code had to terminate before it could delete this file to release the lock
• I've upgraded to the Examine 1.0 RTM binary files - doesn't seem to help
• I've upgraded to the patched Lucene.Net.dll file that is supposed to run okay in Medium Trust - (see http://umbraco.codeplex.com/workitem/28080)

Here is my examine config for the index:

<add name="PublicIndexer" type="UmbracoExamine.LuceneExamineIndexer, UmbracoExamine"
           runAsync="true"
           supportUnpublished="false"
           supportProtected="true"
           interval="10"
           analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net"
           indexSet="PublicIndexSet" />

<add name="PublicSearcher" type="UmbracoExamine.LuceneExamineSearcher, UmbracoExamine"
     analyzer="Lucene.Net.Analysis.WhitespaceAnalyzer, Lucene.Net" indexSet="PublicIndexSet" />

<IndexSet SetName="PublicIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/PublicIndex/">
    <IndexAttributeFields>
      <add Name="id" />
      <add Name="nodeName"/>
      <add Name="nodeTypeAlias" />
      <add Name="parentID" />
    </IndexAttributeFields>
    <IndexUserFields>
      <add Name="pageTitle" />
      <add Name="pageDescription" />
      <add Name="pageKeywords" />
    </IndexUserFields>
    <IncludeNodeTypes/>
    <ExcludeNodeTypes>
      <add Name="Image"></add>
      <add Name="Folder"></add>
      <add Name="File"></add>
      <add Name="Media"></add>
      <add Name="BeerContainer"></add>
      <add Name="BeerOnTap"></add>
      <add Name="DistributorContainer"></add>
      <add Name="FeaturedHyperlinkItem"></add>
      <add Name=FeaturedItemContainer"></add>
      <add Name="FeaturedNewsItem"></add>
      <add Name="GlobalMetaType"></add>
      <add Name="LDA"></add>
      <add Name="Picture"></add>
      <add Name="PictureContainer"></add>
      <add Name="Search"></add>
      <add Name="StoreContainer"></add>
    </ExcludeNodeTypes>
  </IndexSet>

ANY SUGGESTIONS OR HELP YOU CAN GIVE ME ARE MUCH APPRECIATED!

Regards,