Error saving edited calendar entry

Hi,

When trying to save an edited calendar entry I get the folowing error:
(The entry was made by me in another persons calendar.)

detected that there has already been an attempting to recover that
failed
exiting...

Version 0.9.14.001
Latest CVS updates

This occures on a migrated setup (phpgw backup and mysql dump).

I just don't know where to begin looking...and I really need a solution.
Anybody any hints/tips?

TIA
Regards,
Hsing-Foo