i found a difference in the tileset editor. i don't know wether you changed it willful, but the old thing i liked better.
when i make some mapped tiles, and by coincidence want to make a already mapped tile again, it gave instantly this message:
Tile index __ has been already mapped. [...]
when i do the same in the newest version of sgdk2, it doesn't give me the message, but changes the index to 0.
what sense does that make? when i don't look, and click, there is a frame 0 on the first frame of a new mapping, what i don't want, this way or the other.