in one of my computers that access the same imap folders, the "sent" and "drafts" folder show "unread messages", although there aren't any. In fact, the "drafts" folder is empty... the other computer accessing the same account with kmail has no problems. This specific computer also gets stuck at syncing a folder with my google account, so I think there is a problem with syncing (or access rights?) Reproducible: Sometimes
On my new computer I don't have this behavior. Marking as fixed.