emClient crashes when trying to copy folder

I’m running the most recent release of emClient (v9.2.1735)
I tried to copy a complete mailbox ‘folder’ to a ‘local sub-folder’, which caused emClient to immediately crash.
After some recovery operations on the mailboxes and databases it prompts me for my password again, and when entering the pwd it immediately crashes again.
Repairing the installation and fully re-installing does not help - same behaviour.

Any ideas?
br, Walter