By any chance... did you use the Riivolution Codeset (Riivo RSBE01 or something very similar to that) -.- Also, it's probably because of too many codes. Get the most recent gameconfig.txt, load Gecko OS, exit that, then load Riivolution (I think)
You're wrong.
It works for Riivolution, too.
You're suppose to put the gameconfig.txt in the root of your SD Card then load up Gecko. From there you can exit and go back to Riivolution. It'll work then.