https://bugs.freedesktop.org/show_bug.cgi?id=104597
--- Comment #14 from Luke A. Guest laguest@archeia.com --- Looks like it's the same as https://obsproject.com/forum/threads/xcomposite-colours-all-wrong.81265/ and https://obsproject.com/forum/threads/xcomposite-window-capture-not-working.8....
It's been pointed out it's not Obs as TyMiles2012 moved back from the Oibaf PPA on Ubuntu 17.10.1 back to standard drivers and it no longer affects him.