I have similar results to pokeparadox. I have a 3.3u NTSC WII, GC Launcher v0.3 and v0.1 Xi, Mios patch v8 (installed with v0.3).
Upon loading GC Backup Launcher v0.1 Xi:
Press A (auto): Locks at Konami. Use B instead.
Press B (mios patched): Works most of the time, but only in 480i.
Press Y (ntsc): Same as pressing A. Use B instead.
Press R (480p): Locks at Konami logo, but does display at 480p.
Upon loading GC Backup Launcher v0.3:
If disk is in before the program is run: Program displays Backup Launcher logo then blank screen. (TV displays no signal message). To clarify, the "no display" message comes and goes, indicating that a signal is being sent off and on.
If disk is inserted after the program is run: same as above.
If action replay 1.14b PAL (burned, confirmed to work in testing with original gcn games) is inserted after program launch, ejected, and MGS is inserted, all options from v0.1 Xi are displayed except the "Press B (patched mios)" option.
I think we need an option to run the disk with a patched mios in 480p. Perhaps a B + R command?
It is my hope that at least some of this will be of some help to devs, especially wiigator or wanikoko.