Hello guys, this is my first post on MacRumors, so bear with me. Thank you. This is my story so far Got a new MBA early 2014 (13'', 128GB 4GB RAM, SSD) in October 2014. Got out of the box, went through installation of Maverick via WiFi: selected country, etc, etc, no FileVault activation, etc, etc, created user "mycomputer". I was up and running in no time. Happy days...until Yosemite came out and installed it. Anyway, I have been using the laptop before and after updating to Yosemite: creating files, deleting files, adding apps, deleting apps, adding file tags, etc Have been having problems since Yosemite so I took it to the Apple Store guys who reformat the SSD and fresh installed Yosemite via USB. When I was returned the laptop I had to go through the configuration stages as if the laptop was new: choose country, create username, etc, etc, etc I typed the same username (my computer) that I had before I took it to the Apple Store. After completing set up, to my surprise, I noticed that Finder showed the old tags created before I took the laptop to the Apple Store guys. Why do you think this is the case? I can assure you that I had to go throught the set up process as described here http://www.macworld.com/article/2010716/mac-101-getting-set-up.html Thank you for your advice, thoughts, observations and support. Cheers.