I CAN SOLVE YOUR PROBLEM
I know what causes this problem!
I had it one year ago; Norton Anti-Virus (in my subjective opinion) for OS X 7.x does not permit iTunes to write OVER the older Temp file so it forces iTunes to create a NEW one. If you COMPLETELY disable NAV, your problem should go away -- try and and see if it works.
Also, the temp files can be deleted without problem.
PowerBook G4 667MHz | 768 MB RAM | CD-RW | 60GB IBM TravelStar | 100GB FireWire Drive (7,200 RPM, Oxford 911) | Canon Printer & UMAX Scanner | OS X 10.3
"AirPort" (n): 1. Cleared, leveled hard-surfaced area where aircraft take off & land; has control tower, hangars, passenger terminals, & cargo area. 2. Kick-ass, cutting-edge wireless networking technology allowing anyone with a brain to surf the Internet from anywhere in one's home, school, office, local café, pub, or prison cell.