Rated 5 out of 5 stars
It's me again :)
Just to point out that a compatibility issue appears with an extension I've installed after 'Context Bookmarks', called 'Personal Menu'. Removing/reinstalling the latter confirmed the issue was in that pair. When together, 'Context Bookmarks' displays the bookmarks, but under the 'Context Bookmarks' line in the context menu rather than on its right.
As always with compatibility issues, hard to share responsibilities. I tend to think that the cause is rather on the side of 'Personal Menu'