This is on old post, but i have the same issue with autocad general. I have found post with this issue from 2010 so its not new.
Weird its hadnt been patched since then.
Any idea what cause this, or a solution?
Sorry for bad english.
The 'ghost' objects were possibly made in a non autodesk product, was my conclusion...
Attach a copy of your affected file, and we can have a look at it, possibly repair and return it to you.
Thank you mjfarell, but i've already fixed it. Copied to a new draing.
BTW it was fully created in autocad by me.
I've made some testing and seems regen screws it up somehow. I use regen a lot. Its habitat. If i dont use regen , everything works fine. No unselectable objects and no disappearing objects. When i use regen, something goes wrong at a point. I thouth it is maybe graphic card related, but i've read it happened with Quadro card also wich is Autocad certified. I try to use redraw instead of regen, but that doesnt solve everything regen could.
As for the testing,i don't know if any other circumstances need regen to go wrong. I have xrefs (also drawn with the same autocad) in my drawing, blocks, and was goups too. First i thouth groups the problem, but it went go wrong without the groups too. So beyond regen i dont have a clue.