I got a PM and it doesn't get it's status changed to "read" , so every time i go anywhere it pops up. I didn't find any other place where i should state my problem.
Used to get this A LOT before the upgrade, even after logging out then logging back in.. But then, ever since the upgrade, I've changed my settings to not get that pop-up anymore for every new PM, so maybe that's why I haven't been getting that anymore since.