On wake from screensaver, black screen, but functional swipe?

Recently, when I return to my computer after the display has gone to sleep (or the screensaver has activated), my screen goes black. Sometimes I have the spinny beachball, but sometimes it's just a pointer. I do not suspect any high CPU usage since I do not hear my fan. The strange thing is, if I use my 4-finger gesture to switch between spaces and full-screen apps, I can see my applications until the sliding animation finishes, at which point it returns to black. Once, when I caught it just right (during/after the animation), I got a dialog box to appear ("are you sure you want to close all tabs" or something similar) at which point I could use my computer again, until I clicked the "OK" button, which made it go back to the black screen. The only way I've been able to make it go away permanently is to hold down the power button to force a shut-down and reboot.
Recent updates that I can think of:
osx system update (I have 10.7.3 now)
Canon printer driver update (MP620B, driver version 10.51.2.0)
Google Chrome 17.0.963.56
Non-obvious software that I frequently use (If you have the same problem, do you see any patterns?):
PandoraJam Version 2.0 (579)
Cyberduck 4.2.1 (9350)
Textwrangler 3.5.3 (2890)
Parallels Desktop 7.0.14922
Adium 1.4.4
Skype 2.8.0.866
Any help or things to try would be appreciated, I lose work every time I have to force-restart...
Thanks,
-Adam

Update
I thought I would try something that has been used in many trouble shooting situations where there might be a hardware or software problem with the computer. Creating a new user account. While I do have another account to sign into on this computer. I chose to simply "log out" and let the computer go to sleep and later see if it wakes up. Sure enough it does wake up. And acts normally. I'm not sure if logging out is the same as another user account.
What if there is something in my main account causing the "wake from sleep" problem. Outside of "permissions" and "running scripts" to clean up accounting. What can I use to trouble shoot which situation is causing this? I've used a couple of pref checkers but with no luck. Log doesn't show what happens while computer is a sleep. Only reports time it went to sleep. And nothing about trouble waking up. I have seen a lot of wrong permissions in cups iofn the reports. And there are not fixed when trying to repair. Especially, in the Colorsync first aid.
Any advice? Or should I wait for 10.5.6 to see if it corrects my problem before I reinstall software?
Donald
P.S.-the only software I have installed with nightly builds is the WebKit for Safari. It is much faster than Safari. Not sure why Safari is slugging/slowing it.

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