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					Originally Posted by  NEW XTC
					 
				 
				um nope...they put cash on account ahead of any buy...ooops you dun fucked up 
			
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 Since I'm so dumb, I'll have to explain it in simple terms. Hopefully your smart brain can follow. 
I buy 1BC from MtGox for $100 + fees. MtGox then holds my BC. In the mean time, on other exchanges BC has risen to $150., but MtGox hasn't sold any more BCs, so they only have $100 in reserve. I decide to sell my 1BC for $150. MtGox can't cover the sale.
Simplistic view, but when you multiply that by a fast rising commodity and lots of sellers wanting to cash out, that what happens.