lately i have problems with a few movies where i try to rip bluray to MKV and I get an error code 500.012. If I try to copy main movie and then try ripping to mkv i get the same error, however if I try to rip the movie to M2TS i incur no problems. I would like the MKV format as it retains the chapters. Anyone else with the same problems??? How do I go around this problem?