I seem to have stopped receiving a notification in the upper left corner menu when somebody replies to me. I stumbled over a few recent inbox messages when I visited my inbox for other reasons.
Is something broken, or does this happen because I probably left Stack Overflow open in my browser on a computer somewhere?
Edit: For the record, I do get a grey notification (1) when somebody proposes an edit or I earn a badge.
Update: As requested, here is a screenshot (Mac OSX Safari, but it essentially looks the same in Firefox on Linux and Windows. Ugh, now I remember why I don't use Chrome -- the webkit browsers feel terribly slow!).
When I click open the menu, it shows the "hot questions" tab, but my inbox is there and contains some unread messages. None of these are unread, though, but they look the same regardless. (This time I scrolled down and noticed still more notifications further down in the inbox which I had overlooked before.)