It was a tough day for one of the nation's largest transaction platforms to experience instability. Shopify suffered an outage on Cyber Monday, freezing some merchants out of their accounts and point-of-sale systems during one of the busiest shopping days of the year.The financial impact is still unclear. A spokesperson directed Business Insider to the company's status page.Many small business owners posted on social media to tell shoppers that their shipping labels could not be generated and that they may ...