I have also had some problems with not being able to select a certain door panel. Or when I do it does not change. Also I have had a door panel show as expected on only one side, flat on the other. I will suppose I should start documenting it.
Check your Model View Options settings.
For doors and windows level of detail, make sure it is set to 'Full' or 'Detailed'.
This affects your 3D model, but not the object preview for some reason.
Thank you Barry, you hit the nail on the head!
I have never changed that setting on our computers. We just recently updated our computers to the latest AC23 update. Wondering if that changed the setting. Either way, both you and Graphisoft US helped resolve this.
There are so many settings in AC now, at times it gets overwhelming to intimately know where to look for them or if they even exist for what you are trying to do.....progress, I guess.