Backup Exec Selection List Error

Hi everybody,

Can anyone please help me get a solution to this problem.
I'm running Backup Exec 2010 r3 (with SQL 2005) on Windows server 2008 R2.
All backup jobs are running succefully
But since few days I'm can no more view or edit my selection list.
When I test authentification information on BE console, I get this error message:

Stack Trace at BackupExec.UI.BEdlgs.SelectionProperties(Guid[] guidarray, Int32 arraysize)
at BackupExec.UI.Data.JobInst.OnProperties(Command command, LIst 1 listuiObject).

Thank you :) :)