So, it looks like I killed my previous thread by posting the actual issue on here. Sorry, that was careless..

So, I am getting the No Content Erro and my umbraco.config is missing. I got some tips to look for invalid character, which I did and found the following error (this time without the character!):

Error Republishing: System.Xml.XmlException: '', hexadecimal value 0x0B, is an invalid character. Line 4, position 53.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
at System.Xml.XmlTextReaderImpl.ThrowInvalidChar(Int32 pos, Char invChar)
at System.Xml.XmlTextReaderImpl.ParseCDataOrComment(XmlNodeType type, Int32& outStartPos, Int32& outEndPos)
at System.Xml.XmlTextReaderImpl.ParseCDataOrComment(XmlNodeType type)
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace)
at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)
at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
at System.Xml.XmlDocument.Load(XmlReader reader)
at System.Xml.XmlDocument.LoadXml(String xml)
at umbraco.content.LoadContentFromDatabase()

The character is an ASCII (vt) (the female sign it looks like??). I have looked at the most recent Published nodes (reported in the umbracoLog table) within the cmsContentXml table but I can't find any trace of this character! Not sure where I might look for this.

I am also seeing an issue with an indexing problem that lingers from an installation of UmbSearch2 (which has proven to be a mess to deal with). I have not been able to uninstall that package for, so far, unknown reasons. Here is what that is reporting:

Error removing node from umbraco index: 'System.IO.FileNotFoundException: Could not find file 'E:\nic.nhs-healthlink.org\data\_systemUmbracoIndexDontDelete\_apf.fnm'.  File name: 'E:\nic.nhs-healthlink.org\data\_systemUmbracoIndexDontDelete\_apf.fnm'
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at Lucene.Net.Store.FSIndexInput..ctor(FileInfo path)
at Lucene.Net.Store.FSDirectory.OpenInput(String name)
at Lucene.Net.Index.FieldInfos..ctor(Directory d, String name)
at Lucene.Net.Index.SegmentReader.Initialize(SegmentInfo si)
at Lucene.Net.Index.SegmentReader.Get(Directory dir, SegmentInfo si, SegmentInfos sis, Boolean closeDir, Boolean ownDir)
at Lucene.Net.Index.IndexReader.AnonymousClassWith.DoBody()
at Lucene.Net.Store.Lock.With.Run()
at Lucene.Net.Index.IndexReader.Open(Directory directory, Boolean closeDirectory)
at Lucene.Net.Index.IndexReader.Open(String path)
at umbraco.cms.businesslogic.index.Indexer.RemoveNode(Int32 Id)'

Not sure if that is related, but I see a lot of these in the umbracoLog table. 

Any help you can provide please. This is affecting a production site! Thanks all for your help!