I had a number of problems when I moved Beyond TV to a new computer.
During configuration I got "Failed to build Live TV Graph"
In the viewer I got "This file is corrupt or the path ... no longer exists"
"The tv feed may be disconnected"
Turns out that my on board sound drivers were screwed up. Beyond TV Tech support determined that either directx or my sound card were having problems. No sure why there wasn't a better error message.
Anyway, thought this info might help others as I've seen similar problems reported without a solution.