Huh, that's strange, my post disappeared.
Skyworld is the only stage I've been having stage hack trouble in. All others have worked perfectly for me so far. I've tried using three stage hacks over it (using .rels) but they've all frozen on me on the stage menu.
I named the files STGPALUTENA.PAC and got the appropriate st_palutena.rel with the Stage Switcher. For some reason, though, none of them seem to work. I know sometimes there are hacks that won't work over certain stages, even with .rels, but after three times in a row, I'm starting to think there's another reason for it.
Edit: I just tried a hack made for Skyworld and that didn't work either. I have no clue as to why this would be happening.
Stupid Skyworld.
