Incorrect Reading of Header Orientation

[burtonjz]

I have T1w images with the following header orientation

sform_xorient  Anterior-to-Posterior
sform_yorient  Inferior-to-Superior
sform_zorient  Left-to-Right

And some BOLD images with the header orientation

sform_xorient  Right-to-Left
sform_yorient  Posterior-to-Anterior
sform_zorient  Inferior-to-Superior

The anatomical image is not being displayed with the proper orientation, though. The images are successfully coregistered (SPM and FSL visual inspections are normal), but the anatomical is improperly rotated when viewed via Papaya -

SPM:

Papaya:

So papaya is making some assumptions about which axis is which. After running the FSL function fslreorient2std to modify the sform/qform, the issue goes away.