I downloaded yosemite and now itunes won't open. what should i do?

i donwloaded yosemite os x yesterday; and now itunes won't open at all. what to do? (i also downloaded, and re-downloaded, the latest itunes.)

huh. created a new account, and then itunes opened, without my music. then went back to my old account and now it seems to be working. wth?

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