I have a front-end form, built with Gravity Forms, that creates a post on the backend. The form is set to redirect to a confirmation page after submission. When Subscribe2 is enabled, however, the redirect never occurs and I eventually get a 504 Gateway Timeout error. Disable Subscribe2 or unsubscribe all registered users from a chosen category and the and the redirect works just fine.
Any idea what might be causing this? Thanks in advance for your help.