If it can help Mac users out there, I own both a 13 inch MacBook Pro running the latest build of Lion and a Hackintosh PC with a BD burner. Never tried burning a Blu Ray, all I know is they play fine in Mac Blu Ray player. While my MBP fails at burning all kinds of discs, my PC's burning all kinds of DVDs just fine on OS X. Why? I have no idea.

@Harmy: I wanted to extract the GOUT French audio tracks to add them to your mkvs but running times don't match by almost 5 minutes. Is that normal? I'll wait for the SW 2.0 mkv to try again.