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#1371
@Cliff S
One thing that jumps in my mind: ThemeTool.exe
Is There a Silent Command-Line Operation to change theme? - Page 2 - Windows 7 Help Forums
themetool.exe
Never looked into this so far but ThemeTool seems important; since it can silently change/set a theme.
For instance I've noticed after using my CopperSunset theme that if you reboot it can loose its orangy background color, gets back to white set as 'unsaved theme'. Maybe the system considers the background to be in an unsafe margin (too dark?) and changes theme parameters.