Sessions, some work, some donn't.

[eluser]jedd[/eluser]
[quote author="smick" date="1268295690"]
my issue is actually with all browsers.
[/quote]

That's a very interesting - though likely untested / purely speculative - bit of information that could be provided early on.

Actually - 'I have tested with versions i, j, k of browsers x, y, and z' - would be far more interesting.

I tend to not trust people that say things like 'this works with all browsers'. Call me old-fashioned.

Remove underscores (I'm having deja vu) and try again. Confirm synchronised dates between server and client and try again. Etc.