Does your ZetaPrints web-to-print account sit under your own domain name?
Please, make sure it is done using CNAME, not an A-record.
We will be changing our data center some time this year, but sooner rather than later. Having your domain name with a CNAME will ensure that the switch-over happens seamlessly. Any domains relying on an A-record will need to be manually pointed to the new IP at the time of switchover.
So, please, change from A-record to CNAME during the next 2 weeks. We are happy to lend you a hand if this is all too technical for you. Contact email@example.com for assistance.