Ser ut som mange, inkludert meg, har opplevd loops i Garageband som ikke er der. Jeg fant denne løsningen som ordnet det for meg:
Hi. I had the same problem with greyed out loops. I checked in the Garageband Loops folder (Library/Audio/Apple Loops/Apple) and found that the loops were there, but didn't load and when I clicked on them in Garageband the Download reqest window showed up. What I did was very simple.
I quit Garageband, found the Garageband Loops folder and put it in the trash. Started Garageband and found the loops were'nt there anymore. Then I quit Garageband, and put the Folder back again.
By accident I put the folder into another loop folder, but heck just left it there, Garageband then needed to reindex the library, and all loops showed up and worked perfectly. Problem solved