It won't work until they update the firmware. Please contact your cable company and tell them this:
I am having difficulties with the 8300HD box's HDMI output when used in conjunction with an HDMI-switching/upconverting receiver (two different models so far exhibit the same problem). When pursuing the topic with Yamaha Electronics' product engineers, they reported that this is a known issue and is on the Cable box end. Denon's engineers also concurred:
This Problem lays with the Cable box. It is not an HDCP issue. It has to do with HDMI 1.0 compliance. Neither Scientific Atlanta or Motorola boxes were originally designed to recognize a "REPEATER". A repeater is a switching device in the HDMI format. Among other things it is able to pick off the audio bitstream from the HDMI signal. Much more than just a switch!
Conversations with S/A revealed that they have an upgrade algorithm that is available to local cable companies. However, the typical cable company takes 60 to 90 days to issue a firmware update blasts to their customers.
They are continually sending updates to their boxes but only after rigorous compatibilty testing with all other software being used in their systems.
According to S/A we should start to see boxes being updated by late Nov. 2005 But again they stress that it's totally up to the local cable companies to decide how urgently to attack this issue.
Note: This is not a Yamaha issue, all other HDMI switching receivers will produce the same results. (The only exception is certain products that act as a simple switch, not following the HDMI protocol).
Are you aware of this and when can we expect to see the existing fix implemented? I would be happy to expand on this or demonstrate the problem to whoever. As prices drop on HDMI-enabled receivers and more and more models are released this, is sure to be a bigger issue.
Let me know how soon this firmware fix will be remedied and if you require any additional information.