Flatrock Wetsuits review for Mailchimp Email SMS Marketing

I'm leaving a 5 star review as up until this point I've been really happy with the ShopSync integration with MailChimp. However, I do have an issue that needs to be resolved asap. In regards to order notifications, when I click “Start Sending” in MailChimp, I hit a roadblock, as a pop-up window appears which asks me to confirm “My store is up to date”. When I check the box “My store is up to date”, the “Start” button is still greyed out and nothing happens. Any assistance you could provide in enabling order notifications would be greatly appreciated.