ID 486201 - Orient pieces produces incorrect results.

Problem summary
Orient pieces produces incorrect results.

Customer reported version
modo.15.1v1

Customer reported platform
windows10

Steps to reproduce

1) Launch Modo.

2) Create Cube primitive.
 
3) Go to UV layout and not the unwrapped UV on a flat orientation.

4) Click on Orient Pieces and in the pop-up windows select either horizontal or vertical.

5) Note that the unwrapped UV is changed to a 45 degree angle rather than a 90 degree change expected.

Expected behaviour
UV should rotate flat to either horizontal or vertical.

Actual behaviour
Rotation is only partial leaving the UVs at a angle.

Workaround
Unknown. 

Reproduced by support

This bug has been reproduced in:
15.1v1 - Windows 10
15.0v1 - Windows 10
14.2v1 - Windows 10
14.1v1 - Windows 10
14.0v1 - Windows 10
13.0v1 - Windows 10
12.2v2 - Windows 10

Earliest version tested

- This issue appears to be in all versions of the product