Here's what I know or can say about it:
Until now EVERY map I converted from PC that reset on thermal,
I got corrected by adding a texture that was missing or replaced a
texture that for whatever reason caused this. So, until now I can
say that if your xbox reset on thermal, you'll have to find the
problem in the textures area...
Simply copying the missing SM's is the ONLY solution, because
you'll need those SM's if you're porting a map to xbox.
You can't just leave them out. You'll need the map as much
like the original. And with ALL maps I did, I can't remember
a SM that I couldn't copy into 'my' own file...
Crashing the game on lauch can be caused only by a SM if the
texture used by that SM is linked with another texture that's
not present. Like shaders and final blend's...
Also missing sounds can make the map crash on launch.
These I know for sure and I had maps working after
correcting the problems above.
But, there are more things that will crash the map on launch
that I don't know of. I think things like Physics Volume's,
Teleports, other Actors, etc that are not supported by the xbox
can be a crash factor too.
But I agree that I would like too know 100% about maps not loading up...
Didn't look into that too much. Just enjoy porting maps more right now.
Well, this all is ofcourse my own vision on the porting
after doing enough maps these last months...