I am currently utilizing the Linx theme. Whenever I try to change the background image or pattern, it takes the changes and appears to load them, but then always overlays the shadow.png and concrete_seamless.png files from the theme over my chosen background (I just want solid white). I finally solved the issue by replacing those two files with blank white images, but this seems like a bug to me. I don’t want to have to do this everytime.