(1) There seems to be an anomaly (like Sidewinder said) about the Notifications but for me I notice it with the Counter ...
(2) The "Notifications" Menu doesn't always disappear when the User clicks someplace else on the screen. There are times when the User (or at least me anyway) has to re-click the Button before it'll disappear, thus it's behavior is erratic.
WRT the other Buttons ...
- The "Private Messages" button seems to work as advertised; and
- The User Name Menu also seems to work OK.