Hi, after running claws some hours it asks me for the password(s) again and if that happens it doesn't tag the newly received messages as "New". This only happens for the "initial" check after entering the password again, any further mails will be tagged correctly *IIRC*.
Hm, seems it also happens on startup, so not related to the "long" runtime.
Currently it seems that only my GMail account is affected.
gmail has no notion of new messages, unread messages and read messages. It only recognizes unread/read. You need to find their bug tracker instead.