Spreadsheets are what do it for me. Haven't noticed it on anything else. Only whole-screen spreadsheets. Opening the start menu (covers maybe 1/5th of the scree

Spreadsheets are what do it for me. Haven't noticed it on anything else. Only whole-screen spreadsheets. Opening the start menu (covers maybe 1/5th of the screen width and half the height, so 10% overall I'd guess) is already enough to break the pattern. At 110% or 90% zoom it does not happen at all, it needs to be the default zoom level. It's also noticeably less if there are colored cells. You can dial the screen's volume by making the libreoffice window partially transparent (I have that bound to scrolling on the title bar). This is on an Acer 1920x1080 (~23"?) screen from around 2009.