I recently bought the game kit and jumped right in. For starters, I downloaded all the recommended tools. When I went to the tiled map editor website, I downloaded the only version available, which was Tiled Qt 0.8.0 for Mac OS X. After loading my toolbox with all the suggested tools, I went back to the book and began creating my own level. After building all of the layers and getting my files into the right places, I was able to get a successful build in Xcode 4.2. However, when I tried to run it, I got nothing but a list of thread issues. After a couple of hours playing around with different things, I was able to narrow the problem down. For some reason, everything works and runs fine until I try to add any ground tiles. Obstacle layers, object layers, etc.. all work, I’ve been successful with those on the current levels that came with the kit, the template and with a new map (although the ground layer is just empty black). As soon as I add or change ANY tile in the ground layer, it’s a no go. Please help!