Not a bug. You just can't make stuff that big. You know those really big red lines on the grid? You should never even get close to them. You'll get an overflow error. Plus, it'll run like crap, especially for 56k'ers. Look at BSZ, for example. I mean, I can play it great, but most people will suffer some, if not major slowdown. And why? Because it's rather big, and it has lots and lots of things, and it's a NiGHTS level in general. Additionally, a giant level will take forever to load in DB(That ism if it doesn't give you an error), plus you won't be able to use 3D mode. So, yeah. You should probably stay away from making giant levels.