We design our parts in mulit-body parts. We than insert each body into it's own part to allow us to create assemblies e.t.c. The problem we have is that in the parts they change their colour to grey. This is a bit of a pain but can be overcome by chnaging all the parts to a different colour when you see them together in an assembly. This changes the individual part file to this colour also. So far so good.
The problem that occurs is that periodically all the parts return to a grey colour. This usually happens if we have tweaked something and then saved the parts. Is there any way we can stop the parts randomly changing back to grey as it becomes very frustrating after a while.