Show hidden edges not showing

I have a part that I've set to show hidden edges.
It's a weldment, some of the lines show as hidden but others arenot showing.
I have a plates and rsa that are now floating in mid air as the boxthey're welded to does not show.

Anyone else seening this happen?
I'm suspecting that it's a multi-body bug.SolidworksDrawings And Detailing