Hi Tony,
This Save Link and Continue button is actually part of Dynamic Forms and it sounds like you are redirecting back to it after PayPal. Do you have a redirection event? I would suggest your set one up and tie this event to 'Redirect Successfully' in your PayPal Gateway.
Can you please tell me what those 3 events are? Of those 3, what events are NOT firing? Here's a blog on
Completion Events and PayPal. Most of the time, issues with completion events are cleared by following the tips here.
I don't believe the error message is related but let's see first if we can get your events to fire then we'll look at that separately. Thanks!
Candace