Definitely update the firmware like everyone has said. On my copy of TDK I remember it defaulted to standard Dolby Digital 5.1, not Dolby Digital TrueHD, so your player by default should be sending out a signal your receiver already knows on that disc.

And don't forget Serenity comes out on Tuesday! You'll love how good that movie looks in high def! I personally won't be double dipping on it as I have it on HD DVD. Still need to get Firefly on BD though. I caught it on Universal HD a couple months back and I definitely thought it looked good.