I've recently purchased my PBO a few months ago and everything had been working great. It seemed to play anything I threw at it right out of the box. I've recently had some problems viewing a few 720p .mkv files. The latest one is the new Cars 2 movie. All I get is the sound and a blank picture. The file plays fine on my pc running winXP via vlc media player. It also plays to my tv from my macbook (snow leopard) via hdmi. I had this problem with a 720p bridesmaids copy but don't seem to encounter the issue with other .mkv or .avi files.
I have not updated my firmware and really don't know how to check what version is installed.
Thanks for any support.