ubuntuforums site scrolling jerky

[Art Slurry]

hi all,

given fresh install 12.04 xubuntu, all updates

I cannot get the ubuntuforums.org site to scroll smoothly either with 
the mouse wheel, or side bar, or even arrow keys, making it impossible 
to use..

nvidia geforce with version 173 driver installed,
no extensions running in firefox 18.0.1
same result in midori
i've also tried a different video card

anyone else have a problem with the site?  just trying to figure out if 
it's the site or my box

no problems with any other site, nothing relevant in the logs, i'm at a loss

thanks,

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