Hi,
I think I've found a bug in SpritePad Pro 3.52. If I set the tile set quantity to 260 or more, the program doesn't complain, but when I close it and open the project again, I get the message "There was a problem loading the project" and I can't open the project, so I've lost all the work and I have to start over again. I've done some testing and I've found a 256 limit in the quantity of tiles, but I think the program should warn the user whenever the quantity is over the limit to avoid losing work...
Regards.