I've been having problems with an assembly that has two configurations, and both of these suppress parts which both have relations back to a common part. (Brackets attached to a Gear Plate).
After thinking about it I can see why there is a problem ie. the relation has lost the parent feature, but it doesn't always break -- some of the holes in the Gear plate are there, others are not due to broken sketch relations.
Is there a proper solution to this, and does any know why it might work sometimes. Breaking the relations makes it work all the time, but of course then I cannot move the brackets and get the matching holes in the gear plate to move.
-- Regards, Gavin Melville email@example.com