I emailed support, waiting to hear back. It's happened twice now, I check the transaction on the blockchain and the fee is too low, right about 500 satoshis.::://...
What happened, did the money arrive...? I made a withdrawal a couple of weeks ago and it took about 6 hours to become effective in my wallet, at that time the withdrawal fee was approximately $5, in fact: "All withdrawals are now subject to a fixed fee of 0.0001 BTC." so I think you are reading wrong when you mention 500 sat.
It seems the issue have been rectified. And prior to these kind of issue I really don't know the cause although I myself have experience it sometimes but whenever I have delayed or slowed withdrawals I really don't panic as what he did is exactly the best trying to the customer support to actually look into the issue of which if the casino is active like this one they will sort it out in no time.