What browser and operating system are you using?
I have noticed some problems with Firebird and Sun’s latest java plugin that have caused this. It worked fine on IE though.
Also, where is your chat page? I’ll take a look at the code and see what may be wrong as well.
Never mind.. I see your using Safari. This is a tough one for me to answer since I don’t have a mac. I have just updated the applet to 2.7 so it’s as current as it can be. There is a 2.7.2 beta version available that I’ll look at. Perhaps this error has been fixed in that.
I have problems using Konqueor/java on SuSE 9.0 and Safari is based on Konqueror I believe so this may be a common issue? Actually on SuSE it doesn’t ever connect to the servers. (and it doesn’t ask for permission to run when used the first time which is bad)
I suggest, for the time being, that you try Mozilla 1.5 and see if that works for you. I really wish I had a Mac so I could answer these questions better. 
Nothing rhymes with Cindy Crawford after 9 coronas...