Has anyone had problems with Scottrade?

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http://forums.fedoraforum.org – I'm seeing weirdness with Scottrade's main screen with Firefox (not the real-time streaming quotes app). It seems after a few minutes, whether idling or otherwise, Firefox gets into a state where nothing on the Scottrade page is clickable. Firefox menus still work as do other tabs so Firefox itself is still alive. It's as if a timer fires inside Firefox that renders the Scottrade page inert. Manually reloading the page temporarily fixes the problem. This is the only website where I've encountered this. It's particularly annoying when you're in the middle of placing a trade order and the page suddenly goes dead when you're about to submit. System: Fedora 11 x86-64 Firefox 3.5.6 (x86-64) from Fedora Update I thought maybe this was a problem specific to Fedora's Firefox build so I installed the FF 3.5.6 and 3.6.0 i386 from a tarball direct from Mozilla. Same results. I'd be inclined to call this a Firefox bug were it not for the fact that I do not see this behavior on my ancient Fedora 4 machine running Firefox 3.5.6 installed from the same tarball. Any clues? (HowTos)