Rhino 7 not trimming surfaces

Hi All,
I have made a model using Curve networks in Rhino 7.6.21103,13001,2021-04013, when I go to trim it along its centreline nothing happens.
If I save it as a version 6 file and trim it in Version 6, everything works.

Hi Mike - please post a simple file that behaves like that.

Hi Wim,
I think it was just a scale issue. I changed the scale and it works.