Don't update to IOS 8.4 if you still wish to use Sync... It worked half of yesterday but now just freezes. A Google search confirmed widespread issues w/ non-nav, older Sync (2012 in my case). Owner.Ford.Com shows I'm up to date with Sync software. Maybe Crystal will see this thread and magically fix it!
Fix that is working so far: I ran the Sync my iTunes on my files. There were approx. 1600 files it fixed, which is odd since before the update everything worked fine. Next step was to sync phone to iTunes, which did nothing since I had iTunes Match on. Turned that off, which deleted all music off of my phone. Then manually selected songs to sync to phone that had been cleansed w/ Sync my iTunes. Seems to be working just fine now, but lost iTunes match in the process, which may of been the problem. With Match your phone downloads everything from the Cloud, which doesn't get the Sync My iTunes treatment. So far haven't missed anything about Match, and Apple Music still appears to work without it, you just can't download any Apple Music songs for play offline.
With all that said, instead of creating Sync My iTunes they should code Sync to not fail on missing fields. That way everything you download directly to the phone, which is the way the market is now, can be used. Doesn't exactly give me much hope in the development of the Sync software... At some point I'm just going to have to buy a new Raptor to listen to music on my phone!