Hi @Arckaren, several people have had problems installing KDE/Plasma and fingers have been pointed at Wayland, Xprofile, Kwin, Xorg, composting, etc. Take a look at:
for starters and search the forum for more info. My solution was to use the August ISO and let all the updates happen to bring my system up to date. Note, you may have to remove kalu to get a full update. Hopefully there is a hint that you can gleam that will not require a full reinstall. For instance locating .xprofile and deleting it. I never had a .xprofile or xcompmgr to begin with.