It seems to be working this morning from the office but up til last night it wasn't :S
As far browser/OS combos go I've used it on a few different configurations
Home Desktop OS - Windows 7 Ultimate
Firefox 3.6.26 & 10 , Opera, Chrome
Home Laptop OS - Windows Vista 32 bit
Opera, Chrome
Office Desktop OS - Windows Vista 64 bit
Firefox 3.6.26 & 10, Opera, Chrome