Can anyone point me to an explanation of the logic for walls? When I have two existing walls that I want to tie together or separate by dragging the end of the wall to the desired spot, sometimes it works and sometimes it doesn't. When it doesn't work, the wall I'm moving simply snaps back to its original location. I've experienced this in TurboCAD Deluxe 15 and trial version of TurboCAD Pro 16. Doors also react in seemingly unpredictable ways. I've read the online help, and it sheds no light. Can someone point me to a resource or explain what I'm missing?