Firefox rox.
If there are no users at all listed, something didn't load properly. How long has it been since you updated your flash player?
Also you might have a very slow connection. How long did you wait to see if it would load? On dial-up it takes forever and three years to get any kind of chat screen at all.
Or it might be blocked in your region for some reason, although I've never heard of such.
Sorry for all the possibilities, but we're shooting in the dark here. All of the ones I listed and all toinena listed could be the problem, or it might be something else.