A bit of a continuation of the "Action bars don't work" thread, but it's a bit bigger than that.
Installing RealUI 2.2.3 freshly on a client, the install will not work. Masque doesn't get applied, Bartender won't be properly set up, Grid is ignored, Phanxchat doesn't seem to do it properly either, and probably more. Skada works fine though. Should be really easy to replicate.
If you have an install up and running prior to 2.2.3, it will just pull from that and work properly though. Have not tested if 2.2.2 works on a fresh install