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:
<img src="https://dl.dropbox.com/u/16623848/Megoszt/hiba.jpg" border="0" />
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.
Probably a graphics card driver bug if it works on another computer. Have you tried updating them?
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I tried, it has an integrated Intel graphics card, with the newest driver (2009). I have an IBM ThinkPad T43
2009 is still a pretty old driver. If that's really the newest they've got for you, and it doesn't work, you should complain to Intel - Construct 2 is working correctly, but Intel's driver is broken.