MarketPlace eCommerce Plugin messes up my homepage slider

I just noticed that when the MarketPlace plugin is active my homepage slider doesn't work. It disables the photos from being in the slider and makes them line up instead as background images. If I disable the MarketPlace then the slider works again.

My slider works when a specific tag is listed within the post/page. The slider came built in with the theme, currently using Boulevard by Theme Sector. I don't understand how the tags would conflict, but I suspect it has something to do with that. Any reason MarketPress would cause this?