I now have the problem that I can't set background images to all active desktops anymore. I currently have five desktops enabled and set up a series of background images for nine desktops. Selecting this did formerly put the appropriate images to all desktops. Since some days it is only set to desktops one to four, i.e. to the default ones. I suspect that theme customizer might have something to do with that, as it doesn't work anymore since you changed theme handling. Is that possible? It definitely worked after upgrade to PR1.3, so that's not the point. Some help would be really great.