Vector Groups Missing Parts

[SteveNelson46]

I have an interesting problem. I built a project using vector groups of a University of Arizona Wildcat. Everything went well and I transferred it to the card and carved it. I opened the file again this morning and it had missing parts as you can see in the examples. I tried to duplicate the problem by correcting it, saving and exiting the program. When I opened the project again everything seemed okay. I had a similar problem yesterday when I was creating the original project but, I thought it was due to a deletion of the outside perimeter vector so I attributed it to user error. However, the problem reappeared today when I opened it for the first time. I'm still trying to figure out what caused the problem. Has anyone else experienced this?