I can't get any of the tex on any question anywhere to render at all. I'm on windows7 and I've tried FireFox 15, IE9, Chrome, etc. all appear the same: just the original markup is displayed.
I've tried updating, flash, java, disabling all addons, safe-mode, etc.
I can trouble-shoot the problem further, but what underlying technologies are responsible for the actual parsing and rendering of this stuff? I can't really find the root cause if I don't know that part. All I know is it's definitely client-side at some level.