um ... so why did you post here? Did you do a clean install & remove the old preferences folder or let Shareaza use the Discordia Shareaza preferences. That in itself would most likely have not been good for the 'genuine' article.
You sound like a very patient person. I guess you don't share files either right? Just grab songs & run. Welcome to the Gnutella 'sharing' community btw.
And as for iTunes, well everyone has their favorites. I use iTunes, have since iTunes version 2, but these days the program been a little rubbishy. Forcing changes on users. eg: who wants files named 03 03 03 03 03 03 03 03 title.mp3
There used to be an option to stop this in preferences, but iTunes removed the option for the user to change it. Now there's only one way to prevent it.