RunUMD with GTA:LCS crashes

Before anyone starts, I have tried this WITHOUT the CheatDevice at all.

I launch RunUMD. I press O to initiate the file copy. I wait for the copy to finish. I run the game. I load my latest save (which is not the CheatDevice save). I play the game for several minutes.

And then it locks up, and I have to shut it down and restart.

Does anyone know what I may be doing wrong here? Should I go back to MPH Loader? I'd rather save the ~30MB of memory stick space if I can, but I'll use the loader if it will work more reliably, though I recall having missing text on the savegame select screen (is this an issue with me not putting all of the flash0 files in the right places?).

copy the save to the save game data and once you have done this load up the game with the memory stick out and once the other game has started put the stick back in a load the save it should work.

Not only do I not understand what you mean, but the problem isn't with loading savegames. The game will crash if I leave the stick out and let it start a new game.