i've had some strange issues when loading "Muscle Bomber Duo - heat up warriors" (mbombrdj.zip) and "Muscle Bomber Duo - ultimate team battle" (mbombrd.zip).
Bug A - The menu / loading bar did not get completely rendered when having these games loaded, only 1/5 of the screen was rendered.
When trying to reproduce it, i eventually got another bug:
Bug B - The menu/loading screen did not get rendered at all, and the game looked like this:
However, i cannot find an exact way to reproduce the bug. Right now, it seems to be gone.
P.S: Right now, i got Bug A in one of the games, and Bug B in the other one.
P.S.2: Eventually, the emulator crashed when loading a different rom, and now the bug is gone again.
Hope this makes some sense...
P.S.3: Bug A , when triggered, does not happen if i set vsync ON, but it happens when i set it OFF.