Greetings On Mac OS X 10.7.2 I'm currently using HB 'Version 0.9.5 x86_64 (2011010300)' and VLC 'Version 1.1.12 The Luggage (Intel 64bit)'. HandBrake works great for 99% of my video encoding needs. I'm using HB to convert 720 and 1080 .mkv video files that I have pulled off the net into iTunes format. Usually it works as intended. Maybe 1/20 movies it brings up a an error "No Valid Source Found". At first I thought maybe it was a bad rip/dl or what ever. But it had happened a few times now. With the same video playing fine in VLC. There are a few threads around about this same problem. But they are all for people who get this error 100% of the time. And it's usually a 'install vlc' or 'make sure they are both 32 or 64 bit versions'. or something silly. The difference is this is intermittent.