I have an Oppo 103D,(latest firmware) I get a message unknown disc. My ASUS PC BD drive will not recognise the discs neither will either of the players in my living room SONY/SAMSUNG..If you own an Oppo....contact them and tell them about the problem and ask them if you can send the disc to them to troubleshoot....they are very good about that...they will ask you if you have the latest firmware update...and they might ask if you are using the HDMI connection to play this blu ray...if you are attempting to play the blu ray thru analog outputs that could be an issue...the immersion set was released in Sept of 2011...earlier in that year the blu ray association implemented requirements(copy protection)that would stop blu rays from being played from analog sources...I know some people refused to update their older Oppos to retain some of the features that were eliminated by the firmware update...