Sofista90 If you're using a HDMI connection (this does not appear for VGA or DVI) you have the option of selecting YCbCr color mode, which can actually be set to 4:4:4 chroma not just 4:2:0. To try this out, HDMI connection to the monitor, Intel HD Graphics Control Panel>Display>Color Settings|Advanced, select Enable for YCbCr. Also set Display>General Settings|Advanced, select Full Range for Quantization since you're using a monitor not a tv and I also recommend Disable for IT Content (this is a hdmi specification that says to do display device processing based on what is being sent).
martin Interesting experiment to try it on bootcamp. https://kawamoto.no-ip.org/henteko/myapp_en.html scroll down to "Dithering Settings for Intel Graphics"
Quad43 You may have installed a new BIOS that changed things? One thing you could test, put in a different drive, re-install w10 to it and your display driver then try it. If still the same error, then it's not the software since it's a clean install and thus definitely something to do with the BIOS.