I'm using MTR and Popcorn and until two days ago things worked smoothly. But now each DVD I burn won't play on my computer but will play on my regular DVD player. I'm also getting "mac error code 0x80020023" before I burn the DVDs. I haven't been able to find any concrete information on what this means, but it has shown up in the past without any noticable differences in the DVDs (they still played on my comptuer, for instance). Perhaps it is the cause of the problem. I'm not sure. Any help will be appreciated. Thanks.