Hi,
could you please post the debug file here or open a ticket in our support system and send us a debug file?
http://support.boxcryptor.com
To create the debug file do the following:
1) Quit BoxCryptor
2) Type into the Windows startmenu "boxcryptor.exe /debug"
3) Reproduce the error
4) Quit BoxCryptor
5) The "BoxCryptor.log" is located on your desktop
Thanks,
--Robert