can't connect ports

[mypi]

I have placed an inductor in series with the port between two dipole arms. From voxel viewing everything looks fine and connected. The simulation runs without complaints, but the scripted analysis section that just gathers some plots, complains:
Exception: Can't connect ports
I can manually extract the sensors and gather the plots without errors.

GPT tells me there should be a metal voxel between the lumped element and the port. Google says it should be fine as is.

But even though the simulation runs without errors it still seems, in favor of the analysis section , that only one dipole arm is really excited...

Any clue anyone.

[mypi]

I ran the simulation again. This time it ran completely. Physical results the same but without any errors, i.e. the analysis section could indeed connect ports. So is there a random seed thing and a voxeling issue after all?