Dear admins,
I 've noticed two serious problems on this platform. 
First, I sometimes am not able to chat during the game. It goes stuck and I can not type/send anything. I think It has  to do with the java program itself. (I doubt this only happened to me)
Second problem is the go game itself.  You need to enhance it and make some changes.
Let me explain : Some players aren 't  fair-play.For instance, they mark your stones as dead when they're not.
After a million "pass" / "reject", you eventually run out of time and  the game. This is quite frequent.
In order to fix this please add a 'Report user' button or something like this.