My Vix image was a one-off, so I'm not able to offer any support for this. I strongly recommend moving to my ATV image, or looking elsewhere. It was a very early release of Vix 4, and as it's Vix you cannot update it (the main reason I favour ATV).
Are you logging in using "root" as the username and a blank password?
And you will get a blank screen on all channels (except the FTA x5 channels) until you've got your line installed.