It appears that sometime recently (discovered this evening), the viewing options dropdown for changing between the various view types for the stereoscopic images (wiggle, red blue, etc) is no longer functioning. I click on "Normal", but no options appear. I have used this option before successfully, so it must be a bug.
Although, I noticed in Morris Proctor's Logos 6: Training Manual, Volume 2 page 266 it says that the "Viewing Options" for stereoscopic images is designated as "Windows Only", which is kind of odd since I have used this before on my Mac.
EDIT: It appears that a similar bug had been fixed back in Logos 4.5b SR-2 four years ago. Apparently the bug cropped back up again.