I have an Ultrastudio Pro on Win 7 by USB 3.0 (NEC 720201 chipset with 4 ports) connection.
When playing HD and SD files with Media Express and Premiere CS5, both analog and HDMI output is constantly on and off for no reason. The audio level on the panel shows that the signal is going output, but the video is just showing black (flickering) quite often. And the analog audio output lousy sound (while the HDMI audio is fine).
I had e-mail the issue to the support of Black Magic Design and got no answer.