I play on the EU server. I have two level one characters on the NA server that I never used.
I logged into the game the first time after the patch and select 'EU' everywhere and got into the EU server with my characters without issue (hurray!).
Ran around, changed some graphics settings, added back in my deleted Add-Ons.
Exited the game. Reopened the launcher and pressed 'Play' again. It needed an authorization code this time - waited for the email and put in the code - logged in successfully.
The characters I now see are on the NA server. The left side of the screen still says I'm on the EU server. The announcements on the bottom of the login screen say 'North American PC/Mac megaserver' in red, but again, I have the LIVE-EU server selected on the left.
I've tried restarting the launcher and game a few times and continue to get into the NA server. Weird times.