Classifieds still not working after 3.5.1 upgrade

Hello,

A while back, our classifieds plugin stopped working. Upon going to the page it was based on, it would just say :

"Classifieds

Virtual page. Editing this page won’t change anything.

Edit this page."

We were advised to upgrade wordpress, as it was out of date. After the upgrade, Classifieds is not showing any improvement. We have tried deleting and reinstalling the plugin, as well as checking the Capability settings.

Please advise further troubleshooting tips. Thank you