iTunes Match has been finicky for many people since its launch, but as with any service that includes both local and remote components, there’s no telling where the problems lie. Apple has now released iTunes 10.5.2, advertising it as providing “several improvements for iTunes Match,” so perhaps we’ll see some of the iTunes Match oddities disappearing (like why does it sometimes match all but one song on an album?). Also fixed in iTunes 10.5.2 is an audio distortion problem when playing or importing certain CDs. Apple doesn’t explain what “certain” means, but it does make one wonder if the music companies are trying some sort of copy-prevention hackery. (Free, 102 MB)
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Anyway, I just wanted to alert people to the possibility of an issue if there are multiple iTunes match users using the same computer even on different user accounts. This update has not fixed the issue for me.
I really wish Apple had allowed Apple ID merging, since that would have cleared up a lot of this.
On re-reading my post it does look like I'm complaining/asking for help. However, I really was just wanting to warn people about this issue. I agree with you that Apple ID merging is the answer to a lot of issues. I haven't seen any comment from Apple as to whether it might happen in the future. If I get a resolution through AppleCare I'll be sure to let you know.
Thanks for the reply.