Can someone offer some advise please? I have large-ish models and most of the time my parts are in featherweight mode. If those parts gets saved or updated for whatever reason, they disappear in the assembly model. I've tried rebuilding and forced rebuild and they don't come back. I either have to close and reopen the model or change to resolved or or suppress and unsuppress.

How do I get these item to regen with out the pain? Thanks.