July 15th Update:
We are happy to report the recent issue with SEO Studio is now resolved. Please ensure you are using our current extension version, v2.1.1648. If you need to update manually, go to chrome://extensions and click Update at the top of the page (here are instructions).
Thanks again for your patience!
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We are investigating an issue where the SEO Studio tool fails to apply the optimization to a video. We sincerely apologize for any concerns caused.
Please try the following to get the optimization to apply to your video:
On the Video Details page, scroll down and click on 'Show More' to expand all of YouTube's tools:
After expanding the page, try SEO Studio again from the TB menu underneath your thumbnail. This should now apply either a saved optimization draft or a new SEO application to your video.
We will update this article once the issue is resolved. Thanks for your patience!