WORKAROUND:
1. Go to {Diagnostic Server installation folder}Agent\conf\Package\sqlserver_spotlight\2012 SP2 folder
2. Move existing QS_TempDBSessionSpaceUsage.sql folder outside of this folder
3. Copy attached file to this same folder
5. Rename file from NewQS_TempDBSessionSpaceUsage.sql to QS_TempDBSessionSpaceUsage.sql
6. Restart of Diagnostic Server.
STATUS:
Waiting for fix in future version of Spotlight on SQL Server Enterprise.
** By default Diagnostic Server installation folder is C:\Program Files\Dell or Quest Software\Diagnostic Server\