After an update to fedora 25 the area that the application captures i always is a completely black. It doesn't matter if I do an screenshot for the complete desktop, a window or a section. I don't know what might have changed to cause this problem. It was working perfectly in Fedora 24.
Are you using the 'ksnapshot' or the 'spectacle' utility?
I was using the ksnapshot utility. I think the error might not be related directly with ksnapshot but with the new integration of Wayland or something else. At the end I had a lot of problems with video reproduction, programs crashing with the use of a mouse scrolling and more. I decided to downgrade to fedora 24 because it was really annoying.
Hello! Sorry to be the bearer of bad news, but this project has been unmaintained for many years and I will be closing this bug. Spectacle is the replacement for ksnapshot now. Please test again and file a new bug for Spectacle if you still have issues. Thank you!