I'm not sure if I had the same problems as you, Kyoshi, as you have not described what problem you are having.
The problem i had was that no graphics at all would display in the video window, i have however fixed this by making the emulator run fullscreen. To do this add a "-f" (no quotes) to the command line in your shortcut, your shortcut should read something like:-
"C:\blah\blog\gCube.exe" -f
(WITH quotes and your own directory structure)
then simply drag your GCMs, DOLs, etc, onto the shortcut.
If anyone can tell me why graphics won't work in a window then please do, they work fine in gCube v0.1, i have a Radeon 9800PRO 128mb on Win 2000 /w Omega Drivers 4.6 (2.5.51), 1024mb Ram, Athlon XP 3000. Help will be very much appreciated.
Cheers,
Fox