So I got a the Naga 2012 last week and it works great.. But sometimes it'll run into an invisible barrier as if it was at the edge of the screen and can't move any further. In addition sometimes it will skip around when I click or just have my mouse over another tab.
I used the original Naga, Deathadder and Logitech G500 without ever having this problem. If it matters at all I am using the Razer Goliathus Control mouse mat. I have also tried plugging it into other ports on the computer.