PMs, you gotta love 'em! Except, except, except...if you're on IE8, and possibly mixed with some truly cack-handed corporate IT wankshaft.
You know that lovely little 'you got mail' warning? You click it and it goes away? Oh no it doesn't, it comes back, again and again. Each time the screen refreshes.
Logging out makes no difference. The only cure is to shut IE down, and restart it.
I don't know if this is an IE(8) problem, BH, or due to our IT slackjaws nailing everything down. But it's fucking annoying.