Hi Ella, I've dug into this bug for a bit, and the problem is that the surface/surface intersector seems to get stuck in a loop and keeps tracing the intersection curve over and over again, until the curve gets to 15,036 control points in it when it decides that it is too complex and bails out.

It's not very easy for me to determine where the exact bug is in this one, but it appears to have something to do with not handling the tracing near the seam area properly.

I have gathered it up and sent it to the company that makes the geometry library that I use, so hopefully they will be able to fix it up. I'm not sure how long that will take though.

Thanks for posting the bug!

- Michael