No. I do not use SonLVL to edit levels directly in ReadySonic. Besides, no changes were made to LZ's layout or to the demo data. I tried actually changing Sonic's spawn position in the start location array, but that did not work. I tried swapping LZ3 and SYZ3's demos in the demo order, and the only piece of information I can give you is that no matter what level it is, the 4th demo will always spawn me at 0 x 0, regardless of what level it is or what coordinates are placed in the start location array. I even checked the assembled ROM, and the start location array is there and it is what it should be, so why it wouldn't read the 4th level's coordinates is beyond me.