I'm a fairly new user of RoundCube, and I have to say, I'm definitely liking it!
A problem I have encountered which, even more importantly, is reproducable easily I think, is that moving a new message to another folder or to the trash before reading it permanently increases the number of unread messages in that folder. I tried sending an e-mail to myself, then moving the message between every folder I have, and then deleting it, and every folder it has been through is left with its name in bold and a (1) next to it.
Checking the filesystem of the mail server confirmed that the message is indeed deleted.
Keep up the good work! I think I'll checkout RoundCube from CVS, see if I can't submit patches instead of just complaining... ;)
Alan Briolat