if it is set to one subscription only.

What do you mean by this? You mean you've set "Total number of occurrences of regular validity/price (0=unlimitted)" to 1? If that's the case it's working as intended as there's currently no functionality to reset the occurrences. If you mean the "Multiple subscriptions per user" parameter it should have no affect on renewals.

Do you have a condition for that plan under the Workflows tab? This is all working perfectly fine in my tests with my lifetime plans. This behavior wasn't changed either. They should be able to resubscribe if the plan is cancelled perfectly fine unless the plan is conditioned away. It's counted as a renewal though so please ensure renewals are enabled globally and for that plan.

Are the plans completely hiding from view or there's just no resubscribe button? You can see this working below in my tests.




I'm guessing you've a condition or setting somewhere that's just directly preventing this from working. The multiple subscriptions functionality allows it to bypass renewal or resubscribe functionality and would explain why that works as a workaround. This seams like renewals maybe disabled entirely. Ensure "Show Renew/Reactivate buttons" within CBSubs > Settings > Global is set to "Yes". Next edit your plans and ensure "Can be reactivated if expired or cancelled since more than" and "Can be reactivated if expired or cancelled since less than" are set to "Can be reactivated anytime" under the Pricing tab. Aside from that I don't know what setting you've set that's preventing this and will have to PM backend super administrator login credentials so I can take a look.