I have been working on my ranking for weeks. Last night when I logged off I was 44.2. Today when I logged in I was 38.5!!! What happened to my ranking??
Happening to everyone it seems. I reported a bug here: http://forum.shuffleit.nl/index.php?topic=4330.0
The matchmaking seems to have a bug and thinks everybody is 38.75. As it's unclear how a rated game will finally be evaluated, I suggest not playing rated games until this is fixed.
See here (http://forum.shuffleit.nl/index.php?topic=4330.msg18472#msg18472) for a little longer explanation.
The problem has been fixed, matchmaking will now use your correct rating.