I noticed something while playing around the exchange fields.
If you enter the coin information (From?, To?, Amount?, etc.), the exchange will show you the rates in the output info on the bottom left. However, if I switch from dynamic to fixed rate or vice versa, the exchange only shows the current exchange rate between the two selected pairs. It doesn't display the new amount the user will get. I would have to fill in an amount under the "Amount" field again. I think it would be better if the correct amounts are shown immediately after changing the rates.