Very simple answer: do not entrust shady people and organizations with your money. Those lousy prop trading firms certainly fall into this category. If you are truly successful then you should not ever have to deposit money but the opposite, you should have no problem raising funding or work at a hedge fund. Simple as that. If you must work at those prop firms only choose one where your deposit is legally segregated and out of reach of management with legal provision that your funding/accumulated profits can only be touched if any of your trading losses cause your account to get into the red. If none of the prop firms can offer such provisions then obviously you are at risk of losing it all. Not sure why there are any successful traders working at those day trading shit prop firms. Never understood it.
Just read another post on ET about a similar event. This time is with WTS, who holds that trader's deposit and disappears. The link of that thread. Hope it's helpful and nobody here suffers any loss. http://www.elitetrader.com/et/index...osit-after-title-t.294886/page-2#post-4189731