In MEF it is really getting bad.  Last few days several read messages a week or two old started showing over and over again when I would click on my usual Read All New, and new unread messages to me stopped showing unless I clicked on Read New Messages To Me.

Today I read everything once again and then clicked on Mark All As Read and got the number to show as 0.  When I go back I'm hoping it will finally stop showing me read messages and start showing me new unread messages to me.

ETA:  I just went back to MEF and after Marking All Read last time, which was about 15-20 minutes ago.  There are no messages showing unread, either "All" or "To Me."

There was one Unread to Me here in Support that I'd already read though.  It didn't appear when reading messages, but it showed as unread on the Discussion Home Page.  As soon as I finish here I'm going to mark as as read here too.