Windows 7 Desktop Background Locked

StuartProgramming Blog

My Windows 7 desktop background normally runs a slideshow, but one day during a computer crash the desktop background was in the middle of changing and locked with half a picture. This somehow froze out the desktop background manipulation completely. I tried changing themes, rebooting, removing the images in question. The problem is a locked system file where 7 caches the desktop background:
C:\Users\<USERNAME>\appdata\roaming\Microsoft\windows\themes\TranscodedWallpaper.jpg
Delete this file and everything goes back to normal.

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StuartWindows 7 Desktop Background Locked