I've stopped use Polo too.
Reason.. i was involved in BOTH insider scams of WRP/Ripple when the exchange froze and after 10 minutes when it all worked.. It was down 15% while "No one" had been able to trade.
I also saw in real time before that when a 100Btc sell order of Dash was eaten up part by part during a minute .....while the price went DOWN!!!!
Its more fishy things happening over there ....... i say they are scammers.