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ganoncrotch said:

If your graphics card is having issues going back and forth between monitors and resolutions it could be time to google the name of it and best driver for multi monitor displays, could be a simple task of going with a slightly older driver. Alternatively upgrade your OS HDD to an SSD and if you run into issues after changing display output just restart the PC after you change screen you're using, from an SSD a reboot takes about 15-20 secs and it'll iron out and display issues from the other output. Hopefully anyways.

It's windows 7. When I switch inputs on my amp, windows 7 thinks it needs to switch back to the monitor, which is not connected.  Windows 7 then resizes the desktop to 640x480 (or something stupid low, safe mode res). When I switch back to the pc it restores the resolution and output, yet all windows are bunched in the top left corner. Some games don't survive this forced resolution change.
I'll upgrade to win 10 some day, that will probably fix it. Until then, save game first before switching.