Juanita,
I think you may be looking in the wrong place.
Instead of 'Manage 3D settings' .... Look in 'Set up stereoscopic 3D'
Then uncheck the box marked...'Enable stereoscopic 3D' .... I think that should do it!...
cjmaddy,
I have the exactly the same problem, and I follow your instruction, and I solved the problem, thank you a lot!!!