TS3479 Why is the Grab application not capturing an image?

I've owned by 27-inch iMac for about a year now (I'm currently running OS 10.7.5.) and, for whatever reason, today my Grab application stopped functioning.
Specifically, when I open the Grab application and then hit the Shift-Command-A keystrokes to select a portion of the screen to capture, the capture window shows up as a blank white screen and, when saved and viewed, the image is just blank gray.
Any suggestions on a fix? As I said, things have been working fine up until today.
In a possibly related issue, today my Snapz Pro X application also stopped functioning. When I open that application, the entire screen goes black, leaving only the small Snapz Pro X windown visible.
Any help would be gratefully accepted.
Thanks.

Thanks elmac. I was able to solve the issue - both issues, actually (Grab and Snapz Pro X) - by going into the library/preferences folder and trashing the com.apple.screensave.plist file and then restarting the computer.

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TS3479 Why is the Grab application not capturing an image?

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