Help with a graphic issue on units

Before I'll go crazy, does anyone know the reason of the graphic issue attached?
It's a flashing dark strip (that I captured with a lucky screenshot) while scrolling the map to look at units. It happens at certain angle while zooming, not always.
Although initially I was thinking at a fault of my graphic card, now I'm pretty sure it depends on skinpartition because the not-shader version of the same units (without skinpartition) works smoothly.
These are my custom units made with mesh exported from blender. They have 1 skinpartition, as usual for shader units. The same happens also redoing the skinpartition with nifscope.

You should have asked this in your units thread, because more unit modders will look in there than here.

Youre probably right that it is the skin partition/shader. Nifskope's make partition function sucks. I have encountered this before. Either you need to remake it using a FX version, or jsut remove the skin partion or shader and give it gloss manually.

For the moment I've exported from blender the mesh with multi-skinpartition, and it seems to work. But I fear that the issue might arise suddenly, because it's a very tricky fault to reproduce, because it depends from the view corner.
I'll release my units as usual, asking feedbacks from users and modders.