Photoshop CS5.1 Won't Load Images On Screen

Question

I'm having the weirdest issue.... sometimes when I try and load an image it won't actually appear int he workspace. I can see it in the Navigator thumbnail and it's got a check next to the filename in the Window dropdown, but I cannot see it anywhere nor can I seem to be able to make it appear. Am I missing something or is there a shortcut key to force the image to the center of the screen/workspace? I have the latest Nvidia drivers installed and I've even downgraded to PS running in 32-bit mode, with no better luck. I finally disabled OpenGL which seems to fix the issue.
Any ideas would be greatly appreciated.
I'm on a MacBook Pro, 2.66 Ghz Core i7, 10.7.3, 8 GB of RAM

Answer 1

I'm surprised that Apple would attempt such a "hack" design...  Switching graphics adapters mid-stream is no small task, and I can't imagine that they could ever make it work seamlessly.
Keep in mind that the nature of the complex GPU beast is that graphics hardware doesn't all work the same (or right) and application software has to make decisions about what to do and what not to do, and even when to invoke certain workarounds - or it would never be possible to run on multiple platforms. 
Yes, that seems wrong, but it's necessary and it makes developing cutting-edge graphics applications in the real world much more expensive.
The decisions aren't re-made by an application all the time - that would slow things down terribly.  Instead, often the run-time environment is characterized at application startup and the features remembered for later use.  Modern applications actually even create programs (e.g., shaders or OpenCL programs) to run on specific GPU hardware, and they have to be compiled - something usually done by the application at startup.
Now imagine that someone changes the capabilities of the graphics hardware completely after the application has started - even from one vendor's implementation to another (Intel to nVidia).
Like I said, I'm surprised a reasonable system designer could ever think that swapping GPUs at run-time could be made to work.  At least Apple allows you to turn it off!
Does Apple offer any "geek-level" configuration options that can force the use of a particular GPU for a given application?  It seems that this could be an automated workaround that would allow a given application to see only one GPU, which is what Photoshop appears to need here.
-Noel