Roundcube 0.6 stable create imap folders

[kenai]

Hi,

I inherited a mail server which is configured to use mbox format for imap folders. In our case, roundcube 0.6 can create new folders, but not subfolders of the existing ones. Whenever I try to create a new folder/subfolder using a mail client, for instance Thunderbird, it asks if the new folder is going to contain messages or subfolders. Thus, if the first option is chosen, the imap server will create a file (mbox) to contain all the messages for that folder, whereas if the second option is chosen, the imap server will create a file system directory to contain the subfolder files  (mboxes).

I tried to create "newSubFolder/" but roundcube says that folder names cannot contain separator characters. Has anybody had the same problem? Changing to other format (Maildir, mdbox, etc.) is not possible for us right now.

Thanks!