I get the same problem with the FC5-Extras version of blender, using an NVidia graphics card. However, a 2.42 version downloaded directly from www.blender.org
works fine. Thus, this problem doesn't seem to be the graphics card directly, although I'd guess it may be due to link-library paths or something (i.e. maybe the Extras version is calling the Mesa GL libs rather than the nvidia accelerated ones). The Extras version shows a lot of display lag (as well as being partly blacked out) which does suggest it's not using hardware acceleration.