Tweetcaster and network time

Running Android 2.3 CM7 for some time and suddenly after many months Tweetcaster app stopped working. Initially said time scale out of bounds (this was really a clue) , re-installed app, cleared cache all to no effect. It still said "cannot connect to Twitter. " The official Twitter app worked fine. Eventually the problem was solved by adjusting the android system time to use the network automatic time. Somehow this had become unticked and Tweetcaster then worked. It was the only app that seemed affected by by not using an auto network time.