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Enveloppe parts keep hiding themselfs

Question asked by Andre Van Der Velden on Jan 4, 2013
Latest reply on Jan 4, 2013 by Andre Van Der Velden

I have in an assembly several subassemblies containing enveloppes. Every now when i work on these subassemblies and go back to the main assembly all the enveloppe parts are hidden. Why??? and can i do something so they stay visible?