Same issue here with 2017 PRO version which I have used extensively since 2016. Never encountered an issue like this before. I selected and moved a kitchen sink from a cabinet to a neutral area outside the rear of the house for possible use later. When I went back to retrieve it, I couldn't even select it let alone move it or delete it. Going back to "Undo" was not practical because I did extensive plan editing (saving revisions frequently) since moving the sink. Using that "edit area" trick suggested by DJP was of no help either. So finally, I just put a white box around so that it wasn't visible in plan view. An unartful workaround at best but I saw no other choice. But the problem came back to haunt when sending the rear elevation to a layout: there's that sink in the middle of the rear wall and so now what? I fiddled with another box and the eyedropper tool to match the surrounding exterior siding -- to make the sink invisible again. Another unartful workaround but again: no choice. But what happened when printing a hard copy?: the box appeared in the middle of the wall as a dark splotch. This is probably a rare issue but what other issues like this are lurking in this software?
Oh for gawdssakes. That worked, Glenn, after I found the cabinet I took it out of by trial and error. Thank you. Sink is still connected to a specific cabinet even though it's been moved into the back yard. Nonsense in my opinion. I hate it when the software is so smart it's dumb. But thanks again nonetheless.