I have a fairly large assembly that was running slow due to several busy parts, so I made those items into speedpak parts and the assembly ran much smoother.  Now that I am working on making drawings for the assembly my cross sections are not behaving right.  If I try and readjust one of my cross sections I get this error message (below), and I can't select some surfaces of parts that have not been speedpak-ed.  Some of my cross sections are just straight up missing a bunch of pieces and act as if the cut plane was in a different place. 

Long and short of it is that it is behaving strangely.  Anyone have any insight?

Thanks