I upgraded the reviews plugin from 3.1.1 to 3.1.2. Directory Package. After I upgraded, all listings would not load, all I would get was a white page. So I went back to 3.1.1, but had to reinstall the plug-in to "downgrade" the plugin instead of upgrade it. The listings appeared again, but because I reinstalled the plugin the reviews that had been posted were lost, which is okay, because my site is still in development. So I will be sticking with Reviews version 3.1.1 for now.