I'm having this problem both on a Vista notebook and a Snow Leopard Mac,
I'm playing this .mkv file, and after 30 seconds, it jumps back to the beginning, even if i try skipping ahead.
It's really annoying as it works in quicktime X with no issue...i can't seem to work out if its a codec problem.
The video stream says
Codec: avc1
language: und
resolution: 704x480
frame rate: 23.976216
It struggles to load on fast machines and i've only managed to "drag" it past 30s and just get it to continue...
Any help would be great
cheers
Kosta