This issue is very similar to Admin Menu Conflict in that the 7.x-1.0-beta1 version of this theme doesn't work well with External Links. Try this to reproduce the problem:

1) Install the Beach theme.
2) Install the External Links module.
3) Make sure "Open external links in a new window" is checked in the module's configuration page at /admin/config/user-interface/extlink.
4) Clear cache and notice that the module doesn't work at all (it's supposed to simply open external links in a new tab).
5) If you install the 7.x-1.0-alpha1 version of Beach, you'll notice that the module now works just fine, providing further proof that there's something in the beta version that conflicts with External Links.