According to Mailchimp API commas in interest group name MUST be escaped with backslash. Now interest groups with commas in names are completely unusable.

I'm attaching patch to fix this, it was made from 6.x-2.5 version. Didn't checked 7.x version, maybe bug exists there too.

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Component:Code» General
Status:Active» Closed (fixed)

Thank you for submitting this patch. Made some small adjustments and is included in commit fc311bd.

Marked #1257636: Commas in Interest Group names as a duplicate of this issue.