Hi.
About maybe 6 weeks ago I started having this problem ( I suspect Win 1803). First it was only a start button blinking in and out from time to time, but now whenever I start a game, I get the entire taskbar, that so far was on the second screen, on the top part of the first screen.
Setup is bit complicated with two screens (first on 125% DPI and second on 100%) and Oculus Rift, and I am sure this is somehow creating errors, but nor sure how to fix this. I unistalled entire program, removed settings, and started with clean install, but did not help.