I used dvdshrink and reauthored to get the first half of a long movie, and I successfully burned it to disc using DvdDecyptor and Burnatonce. But then, when I repeat the process to get the second half of the movie, the resulting disc won't play. I tried following the steps found in VobEdit and IfoEdit guides to join links etc., thinking that maybe the "table of contents" (don't know tech terms) had been disrupted, that maybe the disc did not understand how to start playing the movie in the middle. But this didn't help. The steps completed successfully, but the result still won't burn to disc (I get disc is blank errors). Any ideas?