Pay per View Paywall and Facebook

Hi guys,
following problem:

1) We are using your Plugin Pay per View
2) User must pay a lump sum by paypal to get access for a period pass.
3) User should login by the integrated facebook login
4) Our Paypal Account is connected
5) Facebook App is created

The whole process is fine it works great for my Facebook-Login, but it doesn't work if another Facebook-User will login.

The user clicks on the Facebook-login Button, than he grants access to Facebook but after that nothing is happenning, forwarding to Paypal will not work.

As i mentioned with my own facebook-account it's no problem, i login and will be forwarded to paypal.

Any idea?

Best regards,