Are you still having trouble with this? Poloniex is finally moving at a brisk pace as of about a half hour ago; the extreme lag people had been experiencing could easily have caused order cancellation requests to go unnoticed.

The site is working great for me today no more lag or problems logging in. 

Great exchanges have great devs. Always top notch with support here!!

busoni is there possibility to restore my MTC that I lost in your exchange site?

Deposit History (Last 25)

Currency   Amount   Date   Status
MTC   12.21489   2014-01-25.07:43:46   COMPLETE

and there are nowhere now, after trading them for BTC...

Finnaly servers fixed

busoni, plz resolve my problem!

btc appears in my account, now I'm successful withdraw!
I will trade more on your market.

Just so everyone knows, it is not recommended that you use your deposit address on ANY exchange for your payout address on a P2Pool. Poloniex can handle "generated" transactions, but they usually take so many confirmations to mature, they might get buried before they have a chance to be registered as a deposit.

The coins won't be lost, you'll just have to contact me to get them.

Wow! What did you do? The exchange went from tormentingly slow to blazingly fast?

Good job!

Improvements are being made all the time. Withdrawals should be a lot more reliable now, and of course the front end is now nice and snappy. I intend to keep it that way. There's nothing I hate more than exchanges that are so slow you can barely use them.

Anon136, what browser are you using? If you place a new order, can you cancel that one? Please PM me with your Poloniex username and I'll see if there's anything odd about your orders.