Strange Problem With Startech eSATA USB to SATA Hard Drive Docking Station and Mac Pro 3,1

Ok. Here's the problem. The Startech eSATA USB to SATA Hard Drive Docking Station and StarTech.com 2 Port PCI Express eSATA Controller Adapter Card PEXESATA2 After 2 weeks of working well The mac can't see the drives. The first thin I tried was using the USB connection from the dock to the mac. That didn't work. Then I tried taking the drives out of the dock and used a eSATA to USB cable and the mac sees the drives fine. So I thought it was a bad dock. I tried using it with my daughter's pc and the dock works well there. Please someone help!! This is one I can't figure out.

Thanks