Wow, this has been an adventure to say the least! I used Logic almost daily and all the sudden, my loops were gone, after purchasing some new ones and I was so excited to try them, but could not load them, all the Apple Loops, everything gone! I read every post and then some twice, trying everything and nothing worked but the one suggestion of someone saying open a new log in account and start from scratch. That worked, including my new loops that I had purchased.
Woke up this morning wondering how I can fix this, if I can get it to work in one place, I should be able to get it to work in others.
So here is what I did for those of you that are still having issues with this.
Go into the Preferences and copy all the preferences that have something to do with Logic, first delete the ones that are there, because obviously they aain't working!, Then under Application Support/Logic/ put the database file in there and that did the trick for me.
I did notice something in the Application Support, maybe this was the problem all along. There was no file in that folder and the folder had Alias as the name.
So, I"m good to go and I hope that helps anyone still not up and running.
Wow, I used to really like using my Mac, but lately it seems all I do is try and figure out why it's acting crazy all the time. It seems all the problems started when I first upgraded to Mavericks. Wish I never had, but Logic 10 required it.
Best of luck everyone and thanks for being there for each other!