I have some random issues with this player after two weeks of using it.
1. If I leave a DVD in the player, turn it off, turn it on and the disc restarts, 1 in 3 times it will say MENU on the front of the unit but nothing on the screen. Nothing on the remote, including Eject, will respond. Only the power off/on button. Once turned back on I might get lucky and the disc will play (from the beginning).
2. Audio of all AVI and MKV lags by a few milliseconds. This is via streaming and on DVD-R. I have tried dozens of files. It's noticeable and annoying but not disasterous - my Popcorn Hour connected to the same TV does not have this issue though.
3. I just put a R4 disc in and skipped ahead a few chapters and the audio was out of sync by at least a whole second. Skipping around chapters did not solve it neither did pause/unpause. I had to stop the disc then Play to resume for everything to be fine.
I have the BD-C5500 connected directly to my Samsung Series 5 32" LCD by a single HDMI cable.
I have performed the region free remote hack to region 9 to enable playback of any DVD.