I have a problem in iTunes with Tracks 3 and 4 that do not show up AT ALL, but tracks 1,2,5,6,7 do show up. (I uploaded the whole folder to iTunes).
When I look at Windows Explorer, I see all the tracks, and tracks 1,2 5,6,7 have details in Title, Contributing Artists and Album fields, but tracks 3 & 4 do not.
In mp3tag, Tracks 3 & 4 show Title & Artists fields, but not in Windows Explorer.
In mp3tag, if I look at the Extended tags, Tracks 1,2,4,5,6,7 show hex data in the COMMENT ITUNENORM field, but not tracks 3 or 4 (compare BOTH uploaded files). This appears to be the only difference between the files that DO show up in iTunes and those that DO NOT.
Perhaps this is not the reason, but it is the only difference that I can find.
Why do tracks 1,2,5,6,7 show in iTunes, and not tracks 3,4?