I'm not sure if this is a problem with USB, Windows XP, IPAC or Game Launcher or a combination of these, so I'll explain here.
My setup is Windows XP, 2Gz CPU, 512MB ram, IPAC4 and OptiPAC both hooked up via USB.
I use Game Launcher for my Front End of MAME. When I have background music running in the launcher, the navigation menu periodically hesitates, meaning that the input doesn't register for about 5 seconds, then it springs back to life. This happens about every 15-30 seconds, and it doesn't seem to matter whether I'm using joysticks (IPAC) or the mouse (OptiPAC) to navigate.
If I disable the background music in Game Launcher, the problem goes away. Also, if I use a NON-USB keyboard or mouse, the problem also goes away (with bg music running.). Any ideas?
TIA
Monte