Every time I fix something...

This should be a relatively easy problem to solve: USB Loader GX is deciding to give me the "An error occurred..." error for almost every game I've tried so far. Mortal Kombat runs fine, but the following 5 games I've tried haven't. It's a fairly fresh install of GX (ver1204 cios 249 rev21008), so I'm betting there are some settings I've either mixed up or just forgot about.

Help please!