I’ve now also tested on macOS using 8.10.24183.22002, and that works as expected.
When you insert the file, have you gone into BlockEdit mode to see if the curve piping option is checked in the properties?
Also, have you checked that the units in both files are the same? If, e.g., you have created the curve in a millimeters file and insert that in a meters file, when you zoom in on the curve, you won’t see the piping because the piping units are not scaled. (That’s an issue on the list to be fixed).
If all else fails, please post a simple 3dm file.
-wim
That’s interesting. This morning I have tried it 4 times… first three times fail; and than it seems to be okay. I’ll mark a solution for now, but I shall return if there is further problem.