I shift r-clicked the builder clicked 2 points around 100 blocks from each other,
and tried to swap to the sphere shape, but crashed.

Confirmed in latest release

Weird it did not give me a crash report,
but it gave me a log thing in the main folder.
Crash log thing.txt

never mind, made a new world and it did it again, this time it looks like the log is useful.

hs_err_pid8988.txt

Thats a seg fault... thats bad but nothing useful found sorry. let us know if this happens again