Photoshop :: 3D Manipulator Tools Gone

I'm using PS CS6 extended, and when using the 3D layout I have been unable to find the neat new manipulators that make moving your object, lights, and camera so easy.  They were there, and suddenly disappeared as if I'd tripped a switch that turned them off.  I have searced all the menus and preference settings to be sure everything is "visible".  I can still maneuver things maually by typing numeric values into the "coordinates" boxes, but that is pretty cumbersome.
 
The only clue I have, and I may be off-base, is from reading about a similar problem in this forum where the response indicated that Open CL must be on.  I thought, "ah ha", it seems like this problem may have started about the time I updated my video driver.
 
Upon checking this in PS, I find the option to turn on Open CL is "greyed out".  Seeing that, I updated my driver again (for AMD Radeon HD 7000) to the latest one, which specified that it includes an Open CL driver.  But that made no difference.
 
Though I still suspect this may be a driver issue, I'm not sure how to fix it.  I could revert back to my original driver if I knew which version it was.  But then, it might not be a driver issue at all.