has anyone burned this successfully with a program other than Imgburn?
As I've said a few times, DiscJuggler worked fine for me with the existing non-fixed .iso. The media I used was in fact a 2.4x Memorex DVD+R DL. But now I've finally exhausted my supply of those, so the next discs to get will be Verbatim, the People's Choice in DVD+R DL. :)