MSN Messenger 6.2.133 & Minesweeper

Cant play Minesweeper Flags since i installed messenger 6.2.133...
Since yesterday people challenge me or accept my challenges but i always get the Unavailable - Try again later message, while my opponent's game starts and waits for me...
What might be wrong?

P.S. I think everything started after i played my first game of checkers against an opponent...

Check your firewall or router settings if applicable? Make sure that the users you are playing have the same version as you. If not that could be a problem.

Hope that helps. and welcome to TZ!