go to http://www.worldofwarcraft.com and click on the "Account" tab on the upper left hand side of the page. This always crashes OW 5.5b3 for me :)
I got the crash. Submitted a crash report.
It also crashed again when I relaunched OW (because my default workspace is set to auto-save, so it tried to access it again upon restarting OW). I was able to prevent this on the 2nd relaunch by closing the tab very quickly, before it could try to load again.