I have had no problem with a straight conversion. Procoder did it very well. My issue is that we WANTED to change the frame rate and sound, not just make it play PAL frame rate and speed on NTSC sets. I'm watching it again and the PAL speedup drives me nuts, as it does others. It took me about a day to completely reauthor the DVD from scratch. I took on the challenge of converting the sound, too, and that's been the issue. None of those links really mention how to do it. They are all methods for just getting the NTSC to accept PAL. After I started, I just didn't want to accept failure. I got a nice frame rate conversion, finally, but then the synch would drift. A simple convert of the sound to the 24.976 speed just doesn't work, either.
Anyway, I'm rendering now. If this doesn't work, then I'm going back to my regular speed version just so it will get out there. We'll know soon.