It has been a while and appeared at a precise point in time some months ago.
'Unused' zones are being progressively blurred on my main screen (1080p, I have another smaller monitor) and it unblurs when the zones get activated (mouse hover, screenshot, etc.) so I cannot join a screenshot (the effect is not visible enough on phone pictures). It is clear it is a software issue because the zones are always clear well defined as rectangles and I couldn't find patterns in the zones.
I looked all over windows' display settings and NVidia control panel settings and fiddled with it but nothing made it disappear or change behaviour.
It appears to exist only in certain applications (web browsers mainly, but not only) and doesn't appear in games for instance. Applications using Electron are very impacted, for instance Github Desktop client
Any idea what it could be linked to ?
EDIT : I could take a semi-decent picture you can find here. Pretty impressive how blurry it can get ! Also, I managed to take a screenshot showing the border between a blurred and a non-blurred zone. Another one