I can't select an edge. Selection filters isn't the issue.

[Hazzmatt]

See for yourself. When you edit Surface-Loft21, select the Open Group <3>. The line that is co-linear with the purple short line cannot be selected.

[zwei]

Interesting... it seem like surface trim 38 is causing the issue? I tried it on my end and seem like it only happen after trim-38.
Maybe a bad vertex/edge?

A little trick i learnt in the past, you can try to copy the two surface (offset=0) and try to re-select the edges using the offset surface again and it may just work

[Hazzmatt]

You're right Zhen, the edge can't be selected after that trim 38 even though nothing was trimmed in that area. Very odd. I initially did the offset of 0 but that seemed to cause issues later when trying to knit and create a solid from this. I think its because the loft with the problem edge is a child of other surfaces and when I do an offset and create geometry from it, this creates 2 different sets of dependencies.

[zxys001]

See for yourself. When you edit Surface-Loft21, select the Open Group <3>. The line that is co-linear with the purple short line cannot be selected.

..something goes south after Surface-Trim38.
..rollback to that and dissect. All the trim's create inaccuracies.
I personally think you are doing too many trim/knit's early on.

..here's a workaround.. create a compcurve before Surface-Trim38

[Hazzmatt]

That's a great workaround. Thanks, that worked! I didn't even know you could create a comp curve from surface edges. I only think of it as a tool to join sketches.