Using Ultrasurf for Chesscube. Is it not possible?

My ISP blocks many sites and hence i have to use a proxy software called ultrasurf to access chesscube.
But the problem is that even after logging in stage 1of 2 i couldn't log in stage 2 of 2. The logging loop continues and after some time i get an error
Funny thing is i can do everything else. I can see live game being played in left hand side, could take chesscube tour but just can not log in further to playing area or main home screen or whatever it is called.

Does anyone has any clue what is wrong here?
Also many a times i could play but with heavy lag(more than 3500) although i could chat without any issues in any room.

Since everyone seemed helpless on this topic i found a solution myself So if anyone else is facing the same problem there is a very simple solution.
Just download freegate software instead of Ultrasurf and enter your network's default proxy in Freegate's settings.