Minor issue. My last two trades for XBT/XRP @ buy/market show 'Canceled' (in red) when they have actually gone through immediately and without issue. It's just a visual thing... It should read 'Closed' (in green).
What does the executed volume say? Did you perhaps do an order for you entire balance? I get this when the fees for the order cause your balance to become zero when executing the order. So say you have 1btc in your account and do a 1 btc market sell order with fees deducted from the btc balance. Then the order will have status cancelled and volume executed 0.999.. or something.