IMAP Folders missing in Roundcube, UEBIMiau

I recently migrated several accounts to a different server. Most of my users use IMAP to access their email, so I needed to transfer a lot of email over.

The transfer went fine on most accounts, but on one (which was done the same way as all the others) I've run into a strange problem...

The transferred webdir folders show up in Thunderbird and in Squirrelmail, but they are not available in UEBIMiau or Roundcube.

(Before anyone asks, yes I did go to the "Folders" tab under "Settings" in RoundCube, and the folders were not there)

This particular user prefers RoundCube, so it's a bit of an issue.

Any ideas?

Okay... It appears that Thunderbird and Squirrelmail are more lenient when it comes to folder names?

The folders in question were named things like:
.Europe
.Forwards

Renaming them to:
.INBOX.Europe
.INBOX.Forwards

caused them to show up in RoundCube.

The strange thing is that the initial folder structure is how they were on the server I migrated from, and RoundCube on that server displayed the folders in question without any problems.

Anyway, problem solved, apparently.

I've run in to this same problem with roundcube.

I really don't want to have to rename all user folders to switch to rouncube...

Any other ideas?

Here is how to fix it in roundcube

edit the file /var/www/html/roundcube/config/main.inc

find this line:

change it to: