MakeMKV is uniformly crashing on me after about 30min of work. Panasonic blu-ray reader and burner, all looks good, then "failed" message. If the movie is short enough to finish before about 30 minutes elapses it converts, but main features crash after 30 min. Tried on rev c MBA and on iMac 2.8. Using the very latest version of MakeMKV updated earlier this week. Thoughts or suggestions anyone?