I've experienced this. Try changing your rendering system in the video settings. Also, have you installed the patch? Sometimes that will fix the problem.
[This community is always eager to help! Glad I could assist ^^]
When I had this problem, most of the time, I could just wait 10 - 15 minutes and try again. Everything would be fine. Is your internet connection strong? And did you just sign up/Have you ever gone in game before now? If so, when did you start having the issue?