So i've been using Poloniex for a couple of years but I did a transfer of 0.05BTC yesterday and it still hasn't shown up.

My account history shows the deposit was confirmed (and so does the blockchain) but my actual trading balance hasn't updated.

I wanted to buy DASH yesterday at 0.06 and now the price is at 0.078....DAM YOU POLONIEX.  You cost me like $100...

Is this common for this to happen?