PSA: Please don't mine at this pool.The pool operator(s) are/is not being truthful and forthright. With all the other pool options available out there to mine with, why in the world would you consider mining on this pool. They've disappeared with miners' coins once. They obviously have no remorse for having done it, ergo they'd be more than willing to do it again.
Also, if you've lost btc mined at 50btc please post in this thread
https://bitcointalk.org/index.php?topic=359277.0Thank you.