The problem is same for any JPEG image really, not only the background I created. As soon as I convert the image to PNG it starts working. I have the same problem when trying to build with both Qt 4.7 and Qt 4.8. I sent you the image and my log file so you can try to reproduce the error. I’m using Ubuntu 12.04 and I installed Qt Creator 2.4.1 using your V-Play installer.
I will use PNG for my project for now. Hopefully you will find out what might be causing this problem.