Ultra Key still shows green screen in the preview

[Carlos26097116ijcm]

Previously, when I selected the background color it became transparent in the preview. But now I select the green screen and it doesn't change. If I render the video, it does disappear, but before I didn't need to render it. Pls help.

Before (ignore green line, it's an example)

 

Now

 

[Jeff Bugbee]

Looks like you've got Composite selected under output so that's right. Can you clear your render cache?

[Carlos26097116ijcm]

Thanks but it still doesn't work, I deleted the render cache as you said, but nothing.

[Carlos26097116ijcm]

The error appeared when using the comparison view. When I activate the comparison view again, the green screen disappears, but if I deactivate it, it reappears.

[Carlos26097116ijcm · Accepted solution]

That was the problem. Solved. Thanks. 

[Jeff Bugbee]

Thanks for the follow up! Good find.