Issue with Track & Trace in Safari

​When using Email Security.cloud Track & Trace feature, the page does not render properly in Safari. Im testing on Mavericks 10.9.5 and Yosemite 10.10.5 (Safari Version 9).  Track & Trace page shows two "search" buttons. Pressing either button yields no results. Pressing a second time produces the below captioned error. I found another reference to the same issue linked below. Is Safari explicity unsupported? What is the support status of Safari on all of the .cloud suite of products?

https://www-secure.symantec.com/connect/forums/issue-messagelabs-track-trace-and-safari-71