kleopatra: An error occurred while fetching the certificates from the backend

Hi,

when opening kleopatra it throws the following error

An error occurred while fetching the certificates from the backend:
End of file

since I've switched to RHEL5 (gnupg2 2.0.8) and kde 3.5.10. I've  
checked the gnupg log, but haven't found a clue about the cause of the  
problem. The logfile can be found here

http://tinyurl.com/7alk5h

Please let me know if additional info is required to track down the  
cause of the problem.

Cheers,

Andreas