Classifieds conflicts with Appthemes/Vantage

The Classifieds plug-in is interfering with the Vantage theme so that a site user cannot "Claim" a business listing. Vantage is a theme that makes a site work something like Yelp.
Do you happen to have a brilliant suggestion as to how to avoid the conflict or do we need to give up using Classifieds?
If you click the button to try to Claim this listing - - you're supposed to get a proper page but, instead, you get a Page Not Found error.