mtgox USD price spike - what happened?

[Flappy]

Price just spiked from 17 down to 15 momentarily.  I had a buy order at 16.27 which did not get executed.  With current buy orders, $400k would have to move for price to drop that far.  What happened?

I would post a picture but this forum doesn't seem to have image hosting for this purpose.

[TrainDeluxe]

dark pool !!!

[lacedwithkerosene]

Mysterious. At this moment there are 10K more BTC demanded than supplied ... pretty impressive. Data from http://buckheadbitcoin.com/ - price may be moving up.

[datguywhowanders]

It's a known bug that MagicalTux is working on.

[jjVon]

I appreciate the post.  I was wondering the same thing as my 16.00 limit order sat un-taken.  As to the dark pool, I thought those weren't supposed to be shown on the data as well as not influencing the market price. 

[FooDSt4mP]

I appreciate the post.  I was wondering the same thing as my 16.00 limit order sat un-taken.  As to the dark pool, I thought those weren't supposed to be shown on the data as well as not influencing the market price. 

Dark pool orders do not appear on the order book, bit the trade does show as a normal trade if it goes through.