I just bought a Plugable Super Speed 7-port USB 3.0 hub (Model USB3-HUB7-81X). When I attached it to my iMac 27 (late 2012) running the latest version of Mountain Lion it appears to work at first and then when I connect drives to it (that work fine in the direct USB port on my iMac) the iMac starts having problems. The machine eventually slows down and nothing works and I must reboot. Upon rebooting I find that I no longer have a fully functional finder (including no menu and sometimes no desktop icons). I also generate Kernal Panics. If I remove the hub, everything works fine. Please help as I really want to be able to use this hub.