MarketPress crashes homepage slider, makes top nav dropdowns disappear

Hello! Am running MarketPress on WordPress 3.5.1 with Red Factory’s New Business v1.2. The install was super easy but then today I realized the slider on our homepage has crashed (one image, no text, no sliding) and the dropdowns from our top nav bar have disappeared.

I deactivated MarketPress and everything’s back to normal. Could this be because our original install was through the person who first installed the MarketPress plugin and the upgrade is through my account and there’s a problem with that being from another account? Or is this more likely a conflict with either the WordPress install or the theme?

Thanks in advance for your help.