You'll have to forgive me if this has been discussed, but I don't see how to search only the forums.
Anyways, I have an assembly largely composed of shrinkwraps, used to produce a machine placement drawing for customers. Some of the parts used in the drawing rep may have geometric tolerances or datums showing up that need to be erased from the drawing views. If you elect to erase all those at one time, the shrinkwraps will also disappear. It's a known problem. So we don't do that.
However, I've been working on a drawing where I erased and deleted some geometric tolerances on a drawing view one at a time, and some of the shrinkwraps disappeared from both the assembly and drawing. I can bring them back in my assembly by going to redefine the rep, but not making any changes; just clicking ok. But on the drawing, the shrinkwraps are gone and can not be brought back. They're gone. In the past, if we elected to again show the geo tolerances, the shrinkwraps would come back. But not this time.
Our admin is going to put in something to PTC on this, but I thought I'd try to see if anyone has had this problem, and was able to resolve it. I often find Creo annoying, but this is the first time it's stopped me from doing my job.