And I'm using the 64 bit version on windows 8. I tried again with a blank project with the same results (can't switch between). I was thinking, even if it did work perfectly for me it would still be annoying to have to switch them this way since if you're layering tiles for background and collision like I am, you would need to move the tilemap slightly so you could click on it each time you wanted to switch between them, then move them back. Surely there must be an easier way to set up switching between the tilemaps.