I was trying to use my ellipsoid in the dev-yt installation to check things, and apparently some of the changes of defining RX,Y,Z relative to get_rotation_matrix in math_utils.py didn't get pulled in or was left out and replaced with calls to get_rotation_matrix, but one of the lines in halo_objects.py has a typo:

r1 = (e0_vector * rz).sum(axis = 1)

should be replaced with

r1 = (e0_vector * RZ).sum(axis = 1)

where RZ are both capitalized.

Fixing that makes the ellipsoid work, can someone check it in please?   Thanks in advance.