When windows are moved down off the botton of the screen
(using WindowMaker /w opaque move) the server crashes or
'freaks out' then crashes. This only happens when the tdfx
module is loaded. It also only happens when moving off the
bottom of the screen.
tdfx_dri-3.9.16-5 rpms, WindowsMaker 0.61.1, 2.2.20-12,
16 bit colour 1488x1116 @ 83Hz.