The longest running UI bug I know
is in Twitter for iPhone (formerly Tweetie). Swiping a tweet reveals an action menu. But if the menu closes — perhaps because you used an option, such as replying, retweeting, or favoriting — then you won’t be able to swipe on that tweet until you first swipe any other tweet. This has been a bug for as long as I can remember. Certainly over a year, maybe 2 or 3.
It matters, too, because if you want to favorite and retweet a tweet, this bug impedes your ability to do so.