recently i noticed that sometimes when i make a move on tactics trainer it shows my move on the screen but doesnt do my opponets move or say i solved the puzzle

please help this problem started after the update on live chess

I am having the same problem. It is EXTREMELY FRUSTRATING and annoying.

Could you please provide a checklist to check for compatibility. Win7, Firefox or IE (both have same problem).

I tried shutting all apps, killing browers, flushing cache and cookies, but it keeps happening.

I don't have time to exhaustively test or do a lot of tactics but I didn't have an issue when I just tried. I'm running Firefox 4.0 Beta 8.