This is happening to me as well.
Removed the channel and reinstalled - no change
Launch from HBC as a boot.dol - no change
Worked fine for ages and now just stopped.
Wii is on 3.3 ciso13a
Hey.
Stumbled across this site whilst looking for all the Wiigator enhancements for the wii
Seems like a nice place so think I'll stick around.
Glad to be here.
I have the original R4 card (not a clone) and GH-Decades doesn't work for me either.
Think I've tried everything.
Unpatched I get the save access screen
Patched I get lovely dual white screens.
May be time I invested in a new, supported card.