We're having a small hiccup with one of our features. I've notified our developers and will post here when it's fixed.
What's Happening: Members are unable to successfully embed links to bookmarks that have red ribbons in the icon (Original bookmarks only have a globe—no red ribbon. The ones with red ribbons indicate that someone has re-saved the original.)
Current Workaround: You'll have success if you try to link to a bookmark with just a globe (the original bookmark).
Make sure the "When to search" field is set to "Anytime" if you don't see an original bookmark in your results.

The Error: You will get an error if you try to link to a bookmark with a globe + ribbon icon (a re-saved bookmark). We are working to amend this.
