well i find it annoying that the orient tool will error when your are trying to orient a joint because it has non zero rotations because of an oddity in IKs which produce the infamous -0 rotation value. granted its highly likely that this is because its rotated ever so slightly outside of the decimal placement you can see but its extremely annoying to chase down those values threw a complicated bone chain.
I hope that Autodesk fixes this or at least has an option to zero the values before orient to remove this annoying little quark of the tool.