Stuck on a white screen

[Large Prune]

As the title implies, whenever I click "game" on the menu at the top, I just get a white screen - I have screencapped this, and here is a link : http://gyazo.com/b2706c04f1a3aa9ead018cec90e40beb.png

What am I doing wrong?

[The Vanguard]

Had the same issue, updating my Java fixed it.

[HappyguyForum]

Like Vanguard said, It is most likely the case that your Java is outdated. Here is a link to a newly updated java, Java Download

[Prayer]

Use the downloadable client it's much better, it may be a browser based problem.