If you happen to be using Windows 10 and have your Region & Language -> Languages set to English (Ireland), changing this to English (United Kingdom) seems to fix the issue.
Reinstalled Windows 10, same username, launched Origin and NOTHING.
Created a new administrator account, launched Origin and IT WORKED!
Moved my files to the new account and now everything works. Somehow by using the same account name as before even when reinstalling Windows didn't work. Had to use a different username. Weird!
In the absence of any information from EA support about this kind of stuff, its pure guesswork why a different user account name would have fixed it. Perhaps a user name was embedded somewhere in your online profile. We have no info from EA as to what if any information is stored within Origin. The main thing is you are fixed.
Might have picked up the ntuser.dat file from the old account.
