I'm having this same issue on a Vista PC.
The trigger seems to be that Apple is attempting to change our songs to match what's in their store. So, for example, if you have a Weezer album that you've classified as "Rock" and Apple has classified as "Allternate", it's going in and overriding your genre choice and switching it to alternate. If you try to switch it back to "Rock", it'll eventually switch it back to "Alternate" again.
Also, if you have bought, say The Styx Wooden Nickel Years collection, which contains the tracks from their first four albums, and separated it out into the albums (Styx, Styx II, etc..) with revised track numbers, itunes is going in and terming it back into the Wood Nickel Years collection and reverting to the original track numbers.
In the process of Apple doing this, or in the process of switching the genres back, somewhere in there Apple reset all the play counts for the "disputed" files to zero.
I think zeroing out the play counts is a bug, but it's a bug related to an obnoxious disrespectful "feature" they've implemented- modifying user files without permission and undoing many years worth of end-user music organization (genre settings, album names, etc..) without warning or permission.
I've responded by blocking the i-tunes store, disabling genius, and basically trying to do anything I can to keep itunes from pinging Apple's servers, because they always seem to serve back things that ruin my music collection, and re-mislabel things I've fixed after Apple does it the first time.
One problem is that Apple has taken away our ability to organize our libraries the way we want to. I don't think they consider that part a bug, and we're all going to have to decide whether to disconnect our itunes players from Apple's servers or switch media players if we can't handle it (I don't think I can).
The second problem is the zeroed out play counts. That's something they probably agree is a bug and will likely get fixed eventually, but they can only fix it in the sense that it won't keep reoccuring after a certain point. What about all the tracks that have already been zeroed out? Apple won't let us manually set play counts, so we can't get those back short of playing the last few seconds of each of hundreds of songs over and over again adding to the count one play at a time, and I don't even know how we'd determine what the old play counts were in order to do that even if we were able to devote the time and energy. Plus, the last played date for all of them would move to which ever day it was done.
They play counts are just lost, and it not only effects the songs themselves, but it makes other play counts less useful. If 500 songs in my library of 12000 plus are zeroed out, how can I compare the play counts to each other? Like a list of "most played" is going to not really be the most played songs and a list of "least played" isn't really going to be least played. Everything is skewered by changes to a portion of the songs. The play counts that haven't been erased are less relevant now. I almost wonder if I'm going to have to start everything over at 0 just to have play counts that make sense relative to each other.
I don't know what to do. It seems like the first order of business would be to restore those play counts so my library makes sense again (Whether I stick with itunes disconnected from apple, reconnect it with apple, or try to transfer to different media software that would port my playcounts)- but it seems impossible.
Second order of business is whether I can stick with itunes or not at all. I mean, ultimately, I lose a ton of features cut off from the itunes servers. Any new device wouldn't be supported, etc.. But if I switch music software, it may not have the features I want, and no one seems to sell anything with the capacity and battery life of an ipod classic (I really value having all my music at my finger tips). My ipod needs to be replaced, it's been a long time, and I've put if off for years because it's not affordable, but I'm going to have to bite the bullet and do it soon, which would be the logical time to leave Apple behind if where they're going isn't a place I want to follow. But what other music players are out there that'll hold 120 gigs like my classic does (or 160 gigs, as the current classics do)? The other brands are all much lower capacity. I have a cheap Android phone with an SD card, but even that tops out at 32 gigs- for *everything* including music, not even just music. And I've got 90+ gigs I want to be able to cart around.
This is a sad, frustrating, and confusing time. I spend hours a day listening to and organizing music. It's an oasis in a world of stress and anxiety. Now it is a source of stress and anxiety. My music collection has been altered in ways I can't fix, Apple seems to be moving in a direction I don't want to go, and no one I know of is offering a music player hardware/software combo that is a replacement that can handle what my ipod class and itunes used to be able to do.
What do you guys suggest?