Check your Task Manager. It runs a big download before loading. Mine took quite a while.
Edit: I should note that I use the full client and I can load the login screen fine.
Ragethreat replied to Abomination's topic in Forum's Archive
I'd like to be able to buy a character too. Due to bugs I can't progress the quest line to unlock Lightforged Draenei. Honestly I'd pay £20 to skip the grind and just unlock them on my account. So annoying.