Same problem here. I have wondered where is the problem.
Mobile client fails

try closing the app and restarting it, or resetting your mobile phone. I just tested with my blackberry and everything is working ok for me.
Restarting and reinstalling doesn't help. Problem appears when I choose option - show all games (not only pending).

Restarting and reinstalling doesn't help. Problem appears when I choose option - show all games (not only pending).
I have not noticed that this mobile chess works normally with "pending" option. It is better than nothing. But still I hope that there would be some solution to that "server send invalid data" problem.
"Server sent invalid data" message has been arrived for last hours. Previously all had worked well. Mobile client is 2.4.0