Can you try in debugging mode (from menu Help) and join the produced log file?

Thanks for your fast Request. I made 2 log_files. I don't know if the Problem is loged.

The first log end when AMC need write access to its database (in the project directory).
The second log reports locking problems.
Maybe the windows<-->linux mount has problems with file locking?

The curious thing is that all the other programs work correctly
Is AMC working under a different user than the user that is loged in?

The curious thing is that all the other programs work correctly

Maybe other programs don't use file locks as SQLite (database used by AMC)

Is AMC working under a different user than the user that is loged in?

No.

Thank you very much! After googling problems with mounts, SQLite and cifs I found the right argument:... cifs nobrl.... Its working now.