I recently installed the Mailchimp and Mailchimp Webform module, created a Mailchimp API key and validated it on the Mailchimp configuration page. However after validation, the "MailChimp Subscription Lists" is blank even though there are several lists created and active on the Mailchimp side.
I had no issues with this in D7 during my proof of concept. Now on D6 and I'm having this difficulty.
I see several mentions of this in D7 but non related to D6.