There is a long standing bug in Windows, where the hover state on taskbar items - highlight and a window preview - gets stuck after having the computer run for a while, as if the taskbar never notices the cursor leaving it. I've had this bug on every single Windows version since Windows 7, on every single installation and every single Windows PC I've used actively. Along the years I've seen people suggest all kinds of workarounds for this, but I've seen none that do more than temporarily fix the issue. This bug has intrigued me ever since I noticed it being consistent across versions, and most recently I checked if it still applies to Windows 10 Anniversary Update, which it does. Why is it so persistent? Why did it survive the "should-not-call-it-metro" changes to the explorer shell? Since there's often interesting discussion and insight on obscure bugs in Hacker News, does anyone have any insight on this? Has anyone ever debugged it?