All Rockeys can be used on USB Ports and Hubs v1.x thru v3.0.
However, USB Hubs have become a commodity item and not all are built to quality standards. On rare occasions the Rockey may not be detected through the Hub due to inadequate output voltage or bad connections.
To determine if the problem is with the USB Hub, check the Rockey in a USB port that does not use a Hub.
If the Hub is the problem, sometimes just plugging the Rockey into a different port on the Hub is enough to solve the problem.
Our experience is that most problems with USB Hubs are related to inadequate power supplied from the computer port. This problem can almost always be eliminated by connecting an AC Power Adapter directly to the Hub.