I managed to play a one hole practice game using IE, but tried at least 4 times using Firefox, and got the unexpected error notice each time. I'm not a PC whizz, but I would say it's a browser issue right now.
Funny thing though,the first try on IE, it opened up on the 17th tee at Oak , but it was a brand new player using starter equipment, and a notice wanted to give me a lesson how to hit the ball, lmao. Needless to say, despite the recent problems on the site, I do know how to hit a ball, and managed to do just that on my second try on IE, leaving my level 97 BB 3W .50 inches just under the hole. :-)