I've never had an issue with usb loader gx, but yesterday after not being able to get some new games to work (monster hunter and prince of persia) i decided to try updating usb loader gx to rev 938 (or whatever the latest one is) so i downloaded it, renamed it to boot.dol and put it in the usb loader gx folder. so far so good. i throw the sd card back in the wii and fire it up, usb loader gx loads fine... i go to play a game and nothing but problems... no matter what game i try (ones that previously worked even) im either getting errors or the black screen or the wii goes back to the main menu.
Is there something else i need to do?
any help would be really appreciated.
Probably should go back to what was working for you and look to see if there are guides for the particular games you are having issues with.