The symptoms you describe sound like you don't have an HDMI v.1.3 certified cable. Is it possible your cable is a 1.2 or lower?
I can not seem to get the anynet function to work. I have a new ln40b640 TV hooked up with the new HT-BD8200, and no matter what I do I can not get the 8200 to play with anynet turned on!! I get sound but NO PICTURE, I get a error msg on the screen. I go into the tools menu from the tv remote and pick anynet+ the 8200 is recogized I pick it it tries to switch over but all I get is sound and no picture, at the top of the tv screen it says HDMI3(which is the correct source) but it also has an error msg mode not supported (I think thats the msg). With the anynet feature turned off I have no problem, I just use the remote for the 8200 for everything. Any thoughts to why I cant use the tv remote with the anynet feature turned on??? Trying to setup the anynet function very, very frustrating.