Error with IPN Callback

Hello,
I updated to the new beta version last month.
My Paypal payments are going through but I do not receive the IPN.
I am still getting the email : subject line: “Error with Paypal IPN Callback” and content: “Wrong nonce: 38cf0e1e05”

The settings are set for automatically approval after payment.

Thank you for your help.

Then update to the latest beta again. WordPress changed the way to generate nonces and I had to reflect that.
Regards