Since discovering I can view Gravity Forms' calls to the MailChimp API from my dashboard at MailChimp, I've conducted numerous tests that identified the failure point as the assignment to a specific group. Unfortunately, nothing I've tried (editing that group name to remove potentially tricky characters, shortening the name, deactivating the MailChimp add-on) works.
Submitting the form [ http://www.lpgeorgia.com/get-involved/volunteer/ ] does trigger the opt-in e-mail and subscribe a user who completes the process - as long as he doesn't select the second option (help with mailings). I've temporarily unchecked the option in the feed setup to assign the user to the problematic group because I don't want it to fail for an actual user; we are adding the person to that group manually if we see in the GF notification that he's selected that option.
I thought there was a chance that I had an issue with caching after changing the group name in my MailChimp dashboard, so I signed out of everything and left it. I didn't have time to come back to it until today, and I did so from a different computer than I've previously used so I feel sure that variable has been eliminated from the mix.
Suggestions? Help?
