Hi!
I'm having the same problem. It also solves my problem (temporarily) what you said about changing the view back and forth, but I can't be doing that every single time I have to move something... I've been having that problem with files I've imported from DWG mostly... I was wondering if you've found anymore answer to that problem since?
I tried playing with the classes and the colors but it doesn't change anything or it just makes objects disappear again.