gunsynd: Control and F5 seem to help with Opera,before so called fix yesterday.
gooberking: JS caching is a real pain to deal with on both ends, and the site is very JS heavy. I've cleared up some oddities with an F5 before. It's always worth a try if things get weird.
No idea if it has anything to do with the logout, but I did have it happen yesterday on one machine. I figured it was because I had been logged in since the beginning of time. I guess there is more to it.
Don't use Java as it has always been a bit,umm I guess you could say not all that