I have the same problem but not everytime. I reinstalled the game twice. The probplem seems to be from their log in system. Someone said to me that you get instant log out after 20 or 30 minutes from their site if you don't acces your character in this time.
It takes me ~15mins and 100% CPU to load the game since Dekaron transferred to Nexon and I'm not the only one who has this problem