Here is my dose to get connected, first one that I think that is going to work better is waiting. The most common reason is that server is getting full and cannot answer to your request of login in. If this happens just wait, and try it again later. Since your browser most likely will have a thing about ping or ping out and it won't try again until the first request gets pinged out. This might take around 5~10 mins sometimes.
Other problem might be that with the bad weather your internet connection gets worser and you lose packages more easily. But I would stick to first option. In some cases the server itself bans your ip for some time if you fill it, trying to connect with different browsers while you are already trying at one and not getting connect and so on. This are automatic bans that should be just for some time around 10 mins to 2~3 hours.
Now if the problem is always the same you can try to see if your pc or browser has installed any new software that could cause problems with flash or with your internet, specially if it is new antivirus, some block flash from internet pages.
Ok, I think I have found your problem and instead of just copying it here and trying to explain I will put it here, http://en.kioskea.net/forum/affich-9214 ... -load-help . Try continuing those steps.
I forgot to say that if you have a dinamyc ip on a pc that usually don't shut down this problem might occur, I am one of those too. ^_^; I hope you can connect to chesscube after doing that.
If you don't like me putting other sites to solve the problem I will rewrite and explain how to do it later. Now I am a bit tired to explain it all. I think it is quite well explained.
PS: Always at your service.