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Blank white screen when capturing a browser window

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paperlait:
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). 

Suggestions?

tomos:
Could be something to do with the anti-virus -- IIRC is often the culprit with blank captures.
Maybe try white-listing Screenshot Captor, and see if that makes any difference.
(What is the anti-virus programme btw?)

mouser:
As Tomos says, it could definitely be a security antivirus program (or possibly a FF security addon or new FF feature) doing one of those irresponsible tricks where it thinks it is helping you and deciding you don't need to be told what it's doing.  In which case you will just need to go find the setting for it that whitelists Screenshot captor.  That would be my guess if snipping tool works.

However, if the FULL SCREEN capture from SC works, and just not active window capture -- then the problem is probably with SC's attempt to grab active window transparency.  And disabling that would fix it -- as would setting a longer delay between transparency flashes.  Let me know if the problem is only with Active Window capture in SC and I can provide more details (essentially just uncheck the "Try to capture Aero Glass transparency" option on the Window Capturing 1 tab).

paperlait:
However, if the FULL SCREEN capture from SC works, and just not active window capture -- then the problem is probably with SC's attempt to grab active window transparency.  And disabling that would fix it -- as would setting a longer delay between transparency flashes.  Let me know if the problem is only with Active Window capture in SC and I can provide more details (essentially just uncheck the "Try to capture Aero Glass transparency" option on the Window Capturing 1 tab).
-mouser (April 10, 2017, 05:07 PM)
--- End quote ---

I already had "Try to capture Aero Glass transparency" unchecked.  Oddly enough when I re-checked it, it worked.  It was apparently related to this function, although reverse from what you described.  The main thing is it works now... MANY THANKS, MOUSER!

mouser:
Hmm... Maybe I better look into this issue and that checkbox function..

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