Addition to my post above, of even more concern:
(3) With Boxcryptor running and two additional folders from the main drive (added to it in preferences->Locations). Each folder contains a few gigs of folders and files, some folders and contents encrypted. Open two finder windows and open the two folders so essentially I now have "Boxcryptor->FolderA" and "Boxcryptor->FolderB". Select all the content of one and drag it to the other, thus performing a "move" (same drive). Boxcryptor will .... splutter... crash ... bang..... OMG I hope I haven't lost all my files!!! Good job I've backed everything up.
The destination folder is showing white folders! The folders are empty. The same folders from the source are gone. Boxcryptor crashes, icon in the menu bar gone. Run BC and enter password, no BC drive appears. Quit and run BC again, drive appears this time. Files and folders seem to be there but I think I'll be comparing them to my backup before assuming they are OK.
I really reaaaaallly don't trust this software with my files and data, perhaps someone should test and debug it? I think I will be asking for a refund. That is all.