It's a bug that I've been experiencing for a while, but only on my laptop.
The tiled backgrounds do not change it's size in the editor, witch makes the editing process a bit fustrating.
Here's a screen:
I set the background size to 640x480, yet it still remains at 500x500 (default size). If I load the project on my desktop PC, it loads fine, no bugs.
My laptop uses XP SP3 32bit, Java7 u4.
My desktop PC uses W7 64bit, Java7 u4.