I have this same issue. I have several hundred tracks that are greyed out, I can't delete them and they don't seem to exist. They also are very odd in that the title of the song doesn't go with the album it's being pulled from. I am extremely frustated with this issue, and if I could move to another service I would consider it strongly. My "love" designations don't stick, and I'm terrified to hit the "update cloud library" button because it means I'll have to go through and re-import my "love" tracks which I saved as a seperate playlist and the exported so i can at least bring them back easily. I'll have to re-delete the grey "waiting" tracks that never resolve, and I will make playlist changes that never propagate to my phone or ipad.
I have re-synced everything. literally 100s of gigabytes had to be redownloaded to 3 devices (Mac, iPad, iPhone).
Home Sharing is turned off (and was never on on my Macbook).
restarting doesn't do anything. it's only when the cloud library gets involve that things become a complete and utter disaster.
it's very difficult to believe a major tech company can't get this to work. shaken my faith considerably. "It just works" seems dead post-Steve.
Been using Apple products since 1983. Never wanted to punch my computer as much as I have the past 3 days.
Issue started when I was finding my library had a gazillion missing tracks (exclamation points) so I started a new library and moved the local tracks back in afresh. (They were all there, the missing ones were in a pocket "Music" folder inside the "Music" folder inside the "Media" folder inside the "Music" Folder. That's resolved now.)
Sorry for rant. I don't know where to go to get help for this. Do the genius bar people knwo this stuff?