Re: Zell23 game "Forest of the Blue Skin"
Windows 10 does some weird window/desktop management compared to other OSes. Try playing around with some compatibility options:
right click --> properties --> compatibility -->
try different compatibility modes, disabling fullscreen optimizations, and run it as administrator for good measure.
Could also be some memory hookers/injectors interfering with frame rendering. Try quitting or turning off anything that could have an overlay or have anything to do with system monitoring, e.g. fraps, rivatuner, etc.
Fullscreen mode with multiple monitors can also have weird effects if the dev hasn't optimized the game to prevent pixel clipping into the other monitor.
There's thousands of things it could possibly be, unfortunately.
You could also try using something like
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as a workaround to screen magnification.