What is the most common compatibility problem among devices with HDMI connections?
The most common compatibility problems have to do with HDCP. Probably the most common failure is the lack of an HDCP repeater function or failure to perform the authentication reliably in all types of usage scenarios. We are increasingly seeing HDCP becoming less and less of a problem as manufacturers iron out the kinks in later generation devices and as cable operators download upgraded firmware to their set-top boxes. In addition, as of November, 2006, the HDMI Founders required all HDMI devices implementing HDCP to undergo a new mandatory compliance testing program of the HDCP functions. This is based on the HDCP Compliance Test Specification.
