If you are still having issues with a Vimeo connection after the VideoWall v1.5.3 update, I recommend that you delete the following stacks from your Stacks folder (if you have them installed).
VimeoWall.stack (this is old and no longer works)
SocialFeedVimeo.stack (this is now included inside of VideoWall)
SocialFeedYouTube.stack (this is now included inside of VideoWall)
After you delete these, you can restart RW and republish all files.
It's not a bad idea for everyone to delete these stacks if you have them installed.