Hello,
in the meantime I did a fresh reinstallation of BE (Prior it was an update from 10.0 to 10.1). Since that install everything works well again.
However, when I saw the problems as described earlier in my posts, I manually repaired DB as you recommended. During the repair process I didn't get noticed about aby issue at DB. So it looked that there were no errors. I did this several times but it didn't fix the bengine.exe crashes.
As said, the only fix was deinstall BE. Run a fresh, new install and recreate all B2D folders all selection lists, policies and backups (Synthetic Backups ).
Kind Regards
Wolfgang