Fulfillment Jobs for Letters

After adding someone to an appointment campaign and the letter gets generated in the Fulfillment Job and we click on it then open the letter, the letter gets downloaded just fine, but Infusionsoft then goes to an error type page and we have to hit the browser back button to go back to our dashboard, then go back into the fulfillment job to complete it. Is this a known issue because I’m not seeing it on the known issue page? Thank you!