I managed to get in last night, though only under a very special combination of circumstances.

I noticed before leaving work that chat connected to my work machine (long-in-the-tooth PC running Chrome on XP).

At home, I was unable to connect with the latest versions of Chrome, FireFox, IE, or Safari on a newish (<1 yr) PC laptop running XP. I tried the last version of Java that worked before the crash, the latest version of Java, and the version of Java that is running on my work computer. No luck with any of these combinations. I get either the error referenced by Dug above, or it just hangs.

Although I did not try it last night, I did try deleting all cookies when trying to get in on Sunday (and it made no difference).

In looking at the Java console, it either hangs right after attempting to log in (I left it in that state as long as 30 min once), or it loads all the sounds and then crashes before loading the first icon (giving the error cited above).

In trying to replicate the conditions that succeeded from work, I tried establishing a VPN connection to the University. That also failed.

Finally, I established a VPN connection specific to my department, and TADA, that one succeeded.

I am far from an expert on such things, but I hope that this info is of value. Literally the only thing that changed between success and failure was establishing that one specific VPN connection.