Can anyone help me figure out why in Yosemite when I rename my Macbook to "Armen's Macbook" it somehow comes back with the same name with a number in parenthesis? It's worked its way up from (2) to (5) now.
I also had problems with turning on Back to my Mac on my machine. I set up my Yosemite as an upgrade, not clean install.
I got it solved by running the OS X Setup Wizard again
(rm /var/db/.AppleSetupDone and reboot), creating new user account, logging in/setting up iCloud from that account and finally deleting the account completely.
Got both my BtmM and Computer Name problems sorted. And contrary to what has been suggested elsewhere, I've now turned on wake-on-LAN again, as having it off prevents Find My Mac functioning.