Success! After installing DIOS MIOS Lite 2.4 (NAND) and updating to USBLoaderGX 3.0 r1203, SD-ripped GC games boot and play just fine now, as it did before.
I'll try Devolution and DIOS MIOS out later just to compare load times and stability.
Thank you very much, Fishaman P, The Real Jdbye...
Thank you for the friendly input, everyone! I'll try installing DIOS MIOS Lite 2.4 (NAND) and updating to USBLoaderGX 3.0 beta r1203. I'll post later with how it goes.
And I made a mistake, Cyan. After checking, my copy of USBLoaderGX is 3.0 r1180.
Okay, I will use an emulator in the mean time, but I'm still confused as to why GC games ripped to SD media could work before the disk install, but afterwards it fails.
Maybe I'm remembering this incorrectly, and GC games never worked on SD via USBLoader?
Thread title basically outlines the problem.
Issue: A recent onset problem using a 4.3U Wii with USBLoaderGX 1.8: I can not play any GC games ripped to a FAT32 16gb SD card. When I press "Start," the screen fades black and after a couple seconds, flickers and reboots back to BootMii. Wii games...
Man we were gonna have a game night at my buddy's house but he wasn't feeling great so he canceled, which throws my dinner plans up into the air, so I guess it's time to order a pizza or something