WP Auctions?

We are using the Hueman Theme. When we install and use the WP Auctions plugin, our drop down menu’s no longer work. We have since deactivated the plugin and they work again. I have asked the plugin site for help, but since we are not PRO users, our concern is put at the bottom of the pile. Anyone else experience this and how was it fixed?

Thanks,
Kev

The page I need help with: [log in to see the link]