Darkmoon Faire loading screen stuck?

I'm a lvl 20 blood elf warlock and I recently went to Darkmoon Faire for a quest (with an odd looking grey and yellow question mark) and went through a portal in an arena looking area and an unfamiliar loading screen appeared (which looked to be a picture of Darnassus), and every time it gets stuck at about 90%. I've tried logging off and logging back on, turning the computer off, etc. I can't abandon the quest because every time I press that character it goes straight to the loading screen. I can't even play as this character. Has anyone experienced anything like this? How did you fix it? Thanks in advance.

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