Whenever I try to bring up any page permissions after our upgrade to 7.04, the pop up window starts to open, then closes and gives us "A critical error has occurred. Please check the Event Viewer for further details.". 

The event view shows about 10 events, all the same, that show this:

AbsoluteURL:

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:b122849b-d3b2-4480-8121-7d81c805cf61

AssemblyVersion:

PortalId:-1

UserId:-1

TabId:-1

RawUrl:

Referrer:

UserAgent:

ExceptionHash:akVab6Y0CMZjDoxWj7/BLg==

Message:Incorrect syntax near the keyword 'SELECT'. Incorrect syntax near ')'. Incorrect syntax near 'U'.

StackTrace:

   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)    at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()    at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)    at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()    at System.Data.SqlClient.SqlDataReader.get_MetaData()    at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)    at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)    at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)    at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)    at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)    at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)    at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)    at DotNetNuke.Data.PetaPoco.PetaPocoExt.ExecuteReader(Database database, String sql, Object[] args)    at DotNetNuke.Data.PetaPoco.PetaPocoHelper.ExecuteReader(String connectionString, CommandType type, String sql, Object[] args)    at DotNetNuke.Data.DataProvider.GetAvailableUsersForIndex(Int32 portalId, DateTime startDate, Int32 startUserId, Int32 numberOfUsers)    at DotNetNuke.Services.Search.UserIndexer.GetSearchDocuments(Int32 portalId, DateTime startDateLocal)

InnerMessage:

InnerStackTrace:

Source:.Net SqlClient Data Provider

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:

Server Name: xxxxxx

Any help would be greatly appreciated, as I don't even know where to begin, and no amount of Googleing the problem has given any clue as to where to look.