Conflict with drop down menu

Hi,
I set up the RecipeCard plugin. I like the design and the way it works. So I’d like to keep this plugin. But I have a tiny problem … My drop down menus disappeared 🙁 I don’t know why or where. I’m lost. But I’m sure you know how to fix that f***** bug. Because you’re awesome.
Here’s a few information i’m able to forward to you :
Wordpress 3.6 / Theme Carpacho (template Monster)

Tell me what you need to know to help me with that problem.

P.S. / Yes, I’m French and my English is a shame 😉

http://wordpress.org/plugins/recipe-card/