That is strange, not sure why that would be - glad to hear it cleared up, but do let us know if it happens again (the greyed out CXRs).
TY too for the info on the displacement and vertex maps, could be useful for the developers to hear about that (if they aren't aware of it already, which they may be!) If you have particular steps that lock things up (e.g. "adjusting displacement strength repeatedly while IR is running") let us know, too!