Are you suddenly getting the error "Element CVV2 is undefined in ATTRIBUTES.
The error occurred on line xxx." for offline orders when customers checkout? It might be a hack. 

Authorize.net is starting to rout all Internet traffic through Akamai, a third-party cloud network service that routes and delivers Internet traffic. You have a year to update to your website but doing it know may help speed up your website. 

Chrome update 44.x released on or about July 22nd is destroying the layout of CFWebstore v6.44 or earlier. Here's how to fix it. 

On May 31st 2015, USPS started requiring the Originzip be passed for Canadian shipments. This update is required to return rates for Cananda. 

Vulnerabilities have been found in the commonly used SHA-1 SSL certificate. All major organizations are moving to the SHA-256 SSL by 2016. Some payment processors are moving in 2015 and if you don't upgrade you won't be able to connect to their websites. 

Mail servers have become very strict. They try to vaildate every email they recieve. When CFWebstore sends the Merchant validation email after an order, it uses the customers email address as the FROM address. Some email servers are either blocking or greylisting these emails because they don't have the proper validation.