I did the update 1.2 Beta yesterday and have had no problems whatsoever. I used a USB3 port, on windows 7.
I also ran the software in WINE on my linux box and got the software to run and connect with the device on that system on a USB2 port.
MAC user, look into WINE for MAC if you are inclined to tinkering. I worked on my LINUX box and MAC isn't so different from LINUX since OSX.
Download Wine for Mac - Run Windows applications (formerly Darwine). MacUpdate.com
Getting Started with Wine on Mac OS X
I HOPE THE LINKS HELP.
Overall my experiences with joyetech and with their products have been good. So far the same holds true for my eVIC.
Could just be whatever driver I had installed. It wasn't a big deal, I just plugged it into a different port and it did it's thing.