Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
New post notifications stuck
On my 2.0.11 installation several users (including me) have noticed that the notifications for new posts on the main page (the little "1 new" box and the different background colour) don't reliably go away.
If we click the link, then go back to the main page (and refresh, it makes no difference) the notifications are still there.
I have tried disabling all plugins and setting the default theme, but it still happens.
Any help would be great.