Pretty Plugins and Premium Plugins

Hello, I use pretty plugins and Premium Plugins (not Plugins Manager) together. For some reason, all of the plugins show as 'Free' regardless of which level I set them at. The plugins show correctly when Pretty Plugins is disabled. Any suggestions?

Thanks!

EDIT: accessing the page: page=pretty-premium-plugins displays the error: Sorry, you are not allowed to access this page. Also, this only occurs on Pro accounts. Everything displays perfectly on Free accounts.