Can't delete mails

Hi ! I'm new on this list and with the use of roundcube... I just installed it yesterday : install OK, login OK, send OK, receive OK. But I can't delete messages. I've read such a story in the archives, but the bug has been closed because SVN version should have fixed it. Problem : I installed yesterday THE freshly downloaded SVN version, and the bug is here...

I have an idea : my host provides me a pop server, with an IMAP "layer" for PHP. And my host doesn't provide the folders functionnality. Could this be the problem ? If there's no possibility to create the trash folder, the mails aren't moved, and they stay in INBOX ?

Thanks for this piece of software, it'll be a killerapp for the freesoftware movement !