Do the error codes show on the screen?
It can also be that the kixtart token cache is not 100% up to date. To check this you could add an else case that will start when the user is not a member of the group. This can be fixed by starting kix with the /f parameter or by deleting the registry key below.

 Quote:

HKEY_CURRENT_USER\Software\KiXtart\TokenCache
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Mart

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