I also have the same problem since this few days ago. I've re-installed the game, and had the same result when login. I've unistalled and, installed the game again. In the end, same result. I've downloaded the installer again, uninstalled the current game and install the game with the newly downloaded installer. Still same result.
It kept saying incorrect client version...
And before this I also experience the same problem like
this one.
I hope this problem will be solved as soon as possible. Gosh, I'm in my holiday now, and it's depressing I can't take this opportunity to play the game. Not to mention, I have a group waiting for me...