I just downloaded this and found everything works perfect expect for one thing, and it is the entire reason why I downloaded it in the first place. To have my own custom background image, but it seems I can't do that. There is a specific image I want it to change to, so I click on "Select File" under the "Background Options", choose the image I want, open it and the background image does not change. Any ways on how to fix this? Am I missing something or am I doing something wrong?