Hi,
What model Westinghouse TV is it? If it's an older 720/1080i model then we won't support it. We only support 720/1080p models.
It could also be an issue with the software being able to read the EDID of the TV. Can you attach the logs from this tool so I can take a look?
http://www.displaylink.com/support/ticket.php?id=269
Thanks,
James