Hi, I saw a post on this from 2014 but the "solution" wasn't clear.  I've noticed since using Pro that the default zero-thickness Room Dividers keep converting themselves into invisible walls with the thickness of a default wall.  I can't be certain but it seems to do it when re-opening a plan or maybe using Undo.  I never recall seeing this issue in HDA.  How do I make it stop doing this?   Thanks