Two Qs on blending

I ran into something odd today. The surfaces in this bit were blendable countless times before but now I get an error message and no blend. The other question is the mesh display not matching up to the isocurves and no way to trim it.

The error I get is:

Command: BlendSrf
Can’t append that edge.

BlendQs.3dm.zip (1.0 MB)

The second image shows a “bad object” Use the command -_SelBadObjects . If something shows up there is an issue with that object and most commands will not work on it due to it being bad in nature

The blending issue in the first image I will need to leave to other users. I dont utilize that command much so I have a harder time troubleshooting what to look for

-A

Thanks Andrew,