Has anyone else experienced this? The display and computer will go to sleep as normal, but then when I attempt to wake it up (with a keystroke or a swipe on the mousepad), nothing shows up on the display. If I turn the brightness up, the backlight goes on, so something displays, just not the contents of the screen. Sometimes after a little while it will perk up. Sometimes putting the lid down and back up helps. Other times I need to power down and restart. The odd thing is that it doesn't happen all the time. I removed Smartsleep (which carried over from my Rev B through Migration Assistant), and it appeared to help, but then it just did it again. There really appears to be no rhyme or reason. Sometimes the screen just won't turn back on (although it appears that applications are still running). Of course, since it's intermittent, so I'm hesitant to take it to the Genius Bar until I can make it happen all the time. It's a 2.13GHz 13" Rev D model. Any ideas?