Screenshots blank or totally black
This can be caused by apps that turn the screen black to prevent capturing such as video streaming apps, games, overlays, or anti-virus software. It may also be caused by using Windows without activating it.
One way you may be able to fix this is to try turning off overlays or whitelisting Gyazo in your anti-virus software.
How to test if it's specific to one app that may be blocking captures
Exit any apps, overlays, or games and try to take a capture of your desktop background.
If captures of the desktop still come out solid black then contact us with the image link which you have a problem and we will help you.