iTunes 9 issues?

Hmmm, well, I'm afraid I'm not going to be much help.

I created a desktop folder with 23 AIFF files and followed the steps you outlined. It imported all of them just fine and they play as expected from iTunes. I didn't time it but I'd guess it took less than two minutes to do the whole 1.04Gb folder.

I'm on a MacBook Pro 2.2gHz Intel Core 2 Duo with 4Gb of RAM running OS X 10.6.1. iTunes is version 9.0.2, like yours.

I don't have any guesses, sorry.

Hi Sfar, thank you so much for your efforts.

I think I must have had a number of corrupt files. I trashed all of the AIF files waiting to be added to my library, and re-converted the original FLAC files. After doing this, I am now able to add the AIF files to my library.

How the files became corrupted, and why none of my software was able to detect they were corrupt is a mystery to me. It must have been pure coincidence that their corruption coincided with the iTunes upgrade.

Great, glad it worked.

I expect you're right. The files I tested were copied to the desktop folder straight from a couple of CD's and had never been through any kind of conversion.