SC captures the complete contents of any active window as expected, except for shots of either Firefox or IE browser windows. All I get in the screenshot of the browser window is the very top title bar, and completely blank white below it. I've tried it with different pages loaded, just in case there is some privacy settings on the particular page I'm on that prevents screenshots. See the attachments... One is using Screenshot Captor (blank), and the other was a Snipping Tool grab.
Just for a bit more info: I have used Screenshot Captor for years on my old computer, but I just started using a different laptop. It is a Dell Precision M6800 running Windows 7. I have multiple monitors set up, using the laptop for monitor 1, and two external monitors beside it (2 & 3). I have external monitor #2 set as the default (in the middle).