I sent this to Tim Cook:
"Dear Tim Cook and Apple,
I'm sending this to your email-adress because
1. The feedback site of Apple went a bit weird when I tried to paste a longer explanation into the comment field.
2. This bug has not been resolved after nearly 2 months or so of iOS 7, and I would like to get some feedback if this issue is being handled.
I have some information in this mail that can help the developers.
The problem is iOS 7 not syncing big playlists of music. It stalls on Waiting for Changes to be applied. Small playlists work, big ones don't.
I have an older 80GB iPod Classic, a 64GB iPhone 4S and now even a new 128GB iPad Air. I also had an older iPad 1 running iOS 5.
Neither of these devices had problems syncing the same music except the 4S and the iPad Air, running on iOS 7.0.3 (I had the problem starting with 7.0 or 7.0.1)
I have this brand new iPad Air that I just completely set up as a new iPad, and even that one refuses to sync, it just stalls when I click on big playlists. It's a new device out of the box, and considering I'm having the same for over 1.5 month, I'm sure this is an iOS 7 bug.
This is everything I already tried on my iPhone 4S before I bought the iPad to get this fixed:
- I had a completely manually managed iTunes Library. I made a completely new library, that I let iTunes automatically manage (copy to iTunes Media + put it in the right folders). I use to do this all myself, being a bit neurotic about organisation, but I noticed that I could save time by letting iTunes do this for me, especially since I already checked 99 percent of the meta data of my music collection. So it's a completely new library, but with the same playlists etc. (I re-made them manually again)
- Removed all the voice memos on my iPhone, because I heard that sometimes could give problems.
- Restored from an iCloud backup. Many many times. Then syncing again starting from zero. Did not help.
- Changed the name of the MediaLibrary.sqlitedb file on the iPhone (I don't have a jailbreak, I did it trough the OSX program Phoneview). This should have iTunes make a new Library on the iPhone. It was still stuck on the same steps with the same playlists.
- I updated to Mavericks, with iTunes 11.1.3 and to iOS 7.0.3, thinking this 'updated' setup would relieve me of the problem. Again, I was wrong.
- I dragged all the 48.000 music files in a utility called MP3 Scan and Repair. It gave me small errors on about 8000 of my files, some of which are never noticeable, or it would cause a song to prematurely stop or skip. I let it fix all those 8000 files, and lost about 75 percent of the artwork of those files in the process. I spent a day fixing that problem by checking which files had their artwork removed, and looking up new artwork on the internet, updating it manually again.
So as you've seen, I already tried *a lot* of measures to getting this problem fixed.
One thing that I DID NOT try yet, is setting up my phone as a completely new iPhone. Reason being that I'm not going to loose 4 years of text messages because Apple has a bug in their software. But, as I explained earlier, I bought a completely new 128GB iPad Air, set it up as a new iPad, and still it happens again.
At this point, I have spent a LOT of money to buy high capacity Apple devices to get a lot of media on them. Your discussion forums have been full with this problem. Everyone sometimes finds another fix for it, I have tried them all, and as a lot of others, this is not fixed yet. I have my new iPad and iPhone almost completely empty, despite paying a lot of money to get the capacity and spending a LOT of time trying to fix or work around these issues.
As a customer who waited for 2 iOS 7 updates already, and 2 iTunes updates, I am loosing my patience. I also sent feedback already in the past about this problem. I would like to get some feedback from Apple if they are aware of this issue, and if there will be a fix soon because if not I can just go and return that expensive iPad and be disappointed.
Thank you for your time,
Best regards,"