Windows 7 Build 7057 Not sure if this is a bug or if its supposed to be this way but when you change themes the Screen Saver goes to "None" and you need to select your Screen Saver again.
It's just a stupid by-design thing. Those themes have a screensaver set, so it sets the screensaver when you apply it. Problem is, that screensaver is "None."
ah the advantages of running my own domain, I don't get a lot of stupid bugs because my GPO's override these things , my workstation GPO forces the blankscreen.scr after 10 minutes