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Trouble with some parts in assemblies

Question asked by Gerhard Hieronymus on Jun 24, 2011
Latest reply on Jul 7, 2011 by Gerhard Hieronymus

Hi,

Recently I've been modeling some of our equipment that is basically made up of various structural members, ie. a couple pieces of tube steel bolted to some c-channels.  For some reason when I make my assembly everything looks fine, my parts have the right holes and are the right color, but then I'll close the assembly and open it a moment later and several of the members are greyed out and are missing all of their holes and I have tons of errors because all of the bolts have lost their concentric mates.  I can't seem to figure out why this is happening all of the sudden.

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