Jquery error when adding Mailchimp Feed

When trying to add a Mailchimp feed I can pick the list and the gravity for however the spinner spins indefinitely.

I get the follow jquery.js script error thus preventing me from seeing the field mappings:

Uncaught Error: Syntax error, unrecognized expression: ;}}return[Math.round(h*360),Math.round(g*100),Math.round(i*100)];
}_field_id

Any ideas?

Glad you got it sorted, thanks for letting us know!