I use 11.04, Classic and sometimes the notifications just pile up, e.g. when I open thunderbird, and login to empathy, and start playing my music, all at once. I can see messages popping for 15 minutes or more. The Ubuntu wiki on notify-osd mentions Flood Prevention. Why isnt it being applied in this case? This overflow/flood didnt happen in 10.04.
I tried killing and restarting the notify-osd process, but then new notifications dont show up. The Me-menu hangs up, and I have to log out to make it alright.
Is this a bug? How do I flush the queue? Is there any workaround?
EDIT: I was able grab a screenshot. And now, all of a sudden, the messages have stopped popping.
The Wiki article you pointed to is not a currently implemented spec - it's a suggested guide for developers of features that should be implemented and how they should be implemented.
This will likely be implemented in the future, for now it's rough going when the queue piles up.