Good morning all. Many walls are greyed out in resource manager. And in the model. But in a previous saved copy of the same file they are not. See both here. I can't remember changing settings like opacity, render options or view/layer options/grey others. None of these are set grey. I have searched the community board without solution. The wall is classified A-G251-M_ExternalWall. I attach its components. Same problems apply to my internal wall class A-G252-M_InternalWall. So I think it may arise from one of the common components? Therefore I have also looked at component class settings within the walls, to make sure none of them are set to less than 100% opacity..they are all 100%. Note other walls are rendering OK. Must be a setting, but which one?! Thank you for any help. I am running 2020 SP4 (build 550627) (64-bit).