In CBSubs admin area:
Look in Notifications and History Logs for the exact IPN error, and mismatch.
This happens when your paypal account has multiple email addresses, and the main one mismatches.
In Gatways, edit that paypal gateway. Put mouse over the "i" for:
- PayPal Business
and for
- PayPal Main receiver account (email)
and make sure to fill in correctly both email addresses.
Main receiver account corresponds to Paypal MAIN email.
Paypal Business corresponds to the email you want to use for that payment.
Paypal allows multiple emails (business), but only one account (receiver account) per person or company.
Hope that helps
Looking forward to your feedback on the above.