I burned two audio CD-R's with 19 resp. 18 tracks. ExpressBurn says the CD's were successfully created. And there are really 19 resp. 18 tracks on the CD's.
However, on the first CD the tracks 15 - 19 are empty and so are the tracks 13-18 on the second one.
OS is Win XP SP2, the burner is a Samsung CDRW/DVD SM-348B.