URGENT – PMPro Addon Packages redirects all posts to Membership Levels page?!

I have created a site for my client using PMPro, Addon Packages and The Events Calendar. My client needs to go live ASAP.

I have set it up so that one membership level is called Single Class Membership and is free – this should then allow users to purchase individual classes via Addon Packages.

However, when I add a price within the Addon Packages box on the individual Custom Posts (Events) and sign in with a test user account who has the Single Class Membership – then try to access an event page, it automatically redirects to the Membership Levels page… if I remove the cost in Addon Packages, then it works.

Help please! I need to sort this ASAP!!!
(I also emailed you but I need to sort it ASAP and haven’t received a reply yet…)