Created attachment 578554 [details] Picture 1.png User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a2) Gecko/20111130 Firefox/10.0a2 Build ID: 20111130042015 Steps to reproduce: Visit http://www.vhfestival.com/ on OSX Make sure the window is small enough that you need to scroll the homepage vertically. Compare to Windows. Actual results: The left-hand column featuring Festival Archives has a white background (it should be black). When scrolling the screen doesn't refresh correctly. See attachment. FF 6 works correctly but 7 and 8 don't. This is Mac only Windows renders correctly. Expected results: Column background should be black and the scrolling refresh.
I suspect this is bug 689962. The black background image is a single color encoded in png (given as data url) of 8-bit color depth. Please reopen if you find the fix in that bug (once it is done) does not fix your problem here.