1. Are there actually 2 instances of the same component in the assembly?
2. Do you use Alternate Position Views?
1. Nope, only one instance of each.
2. Not on purpose! I did accidentally create one the other day though. Possibly right around the time this problem surfaced. So I deleted the view, then deleted the alternate position configuration (it wouldn't let me delete the alternate position with the exploded view still on the drawing), recreated the view and it works now.