Of course, after I post, I think I figured it out…
You’re right, I think, it is the theme you’re using. Whomever coded "monochrome" failed to properly load jQuery, as a result jQuery is getting loaded 2x, once by WordPress, and again by "monochrome" creating a conflict, and causing the plugin to fail.
I think, though I could be mistaken, that if you can resolve that issue, you’ll be good to go.
I’d recommend talking to the theme creator and having them properly queue their scripts (or if there’s a good reason to use their own, to replace the built in ones).