I tried withdrawing 0.5 BTC over an hour ago. My balance went down, but I didn't receive any coins.
Please be more attentive to
Minimum withdrawal amount is 0.01 BTC. The current maximum withdrawal is 1 BTC per 24 hour. Transactions will be processed within 24 hour from the time the withdrawal is requested.
Note personally for you: Users who have not won BTC and have received a gift from us could have wait a little longer.
We bring you our apologies if we have delivered you any inconvenience.
I saw this in a recent forum post:
Transactions will be processed within one hour from the time the withdrawal is requested.
and didn't realise it had changed.
When we talked about the 1 BTC bounty for me reporting the exploit in your site instead of stealing your bankroll, you agreed to pay me 1 BTC so long as I waited "a few days" before withdrawing it. That was 5 days ago. "A few" typically means 2 or 3. Note also that this wasn't a gift, it was a bug bounty for a serious exploit that I found. I did the honourable thing and reported it rather than helping myself to your coins. Now it's your turn. I have waited over 100 hours already - more than you requested that I wait.