Hi PaQ, turns out this was actually a separate bug from that fillet one, but it was also one that I happened to fix already for the next beta.

It was a regression in that geometry library that happened back a couple of betas ago, involving trimming sphere surfaces.

The way the bug happened, it actually did not cause a problem in the boolean calculation itself though, but in the tessellator. So that problem there is actually a messed up display mesh, not actually messed up geometry.

At any rate, it is all fixed up for the next beta.

I'm not surprised that it took until about now to work some of the kinks out of the geometry library update, that actually went a lot smoother than I had worried it might.

Thanks very much for gathering up the bug report!

- Michael