Although my blog is mostly aimed for PC users something in it maybe helpful. If not contact the staff directly via Help & Support if this hopefully temporary glitch doesn't go away on its own.
http://blog.chess.com/NimzoRoy/diagnosing-and-fixing-internet-problems
Hello,
For the past week or so the analyze feature for the turn based on line chess games does not seem to be working properly.
It takes the proposed move, flickers, then reverts back to the original set up. I also seem to have performance issues with other features.
I'm running on a mac with safari. Haven't had a problem till recently.