Thank you for taking the time to test BK 3.12.13-alpha. I appreciate you doing that!
Co-incidentally, the mesh generator was identified to have 5 faults by Martin Serrer (see the CHyMS Blue Kenue Community ticket number 17 if interested). The last fault identified an issue with a root cause that line values are always zero.
Internally, I suspect that your new issue and that meshing issue are, in fact, the same underlying fault. And I've been working for the past 10 years to move Blue Kenue to a new (internal) way of doing things. This fault is a part of that long term work and now I need to directly address this large change.
For this past week I've been working on sorting this large change out. Therefore, the next alpha of BK may have faults in any of the following areas: 2D Lines, 3D Lines, Cross Sections, Segments, GEN1D Segments, EC OneD Segments, 2D Points, 3D Points, Nodes, GEN1D Nodes, EnSim Networks, Hydro Networks, EC OneD Networks, etc.
So, as you might imagine, I'm taking my time and doing my best to be careful with this large internal change... and testing as much as I can with the time I have available.
Kindly,
Alan