Viewing the master file

Okay, here's another problem (along with the cropping and rotating issues that still exist) since the latest update:

I cannot view my master files after I have made adjustments to an image. You know how you just hit M and can see the difference of the original and the changes? Well, that doesn't happen anymore.

UPDATE: Even before I finished my thoughts, I can now view the master. But I have to exit Aperture and then go back in for it to work.

Obviously not the smooth workflow I experienced before 3.2 or before upgrading to Lion. I am VERY close to making the switch to Lightroom and never looking back.

SECOND UPDATE: Actually, the problem is in full screen mode. Works fine in non-full screen mode. Grrrr. I want to kill the Lion before it kills me!