Restarts often resolve these little glitches.I have had a strange bug minutes ago.
My PC monitor is set to turn off after 15 min of inactivity of save power.
After being turned off, I have moved the mouse; it has been turned on with everything in violet color instead of grey (W settings, browser, MS office).
I could not find anything new in W settings to revert, so I restarted the PC, everything back to grey (fixed).



