iTunes truncated tracks and library problem

Force quit iTunes. Wth iTunes closed make security copies of both files. Put the original iTunes Library.itl file (the one you deleted) back in the iTunes folder and see if iTunes will start normally. Note that iTunes doesn't generally need the XML file. It is used to provide access to the library to third party apps when iTunes isn't running, and for the library rebuild approach you took earlier that didn't work, but iTunes may work better if you're not generating it all the time.

Assuming iTunes opens normally tell me more about one of the tracks that won't play fully. In some cases it may help to go into song info and delete any value shown in the stop time on the options tab. If the track itself is corrupt then rebuilding the library was never going to fix it.

tt2

It isn't the approach that I would have taken. Do you still have the iTunes Libary.itl file that you delete in the trash? Would that file have been captured in Time Machine or some other form of backup?

tt2

I seem to recall a bug at one point that randomly set early finish times for some tracks. Deleting the finish time resets them. Another potential problem would be a file that has for reasons unknown become corrupted so that only part of the audio data remains available. iTunes would play this until it runs out of data, then skip to the next track without raising an error. Another build would drop the last 6 seconds of the last track ripped from a CD. If clearing the finish time doesn't help then you might need to restore the problem tracks from a backup or re-rip them.

tt2