Why can't I withdraw my winnings while my balance is positive?
You may see a positive balance and yet cannot withdraw your balance. It is certainly because this money comes from your playable bonus balance (bonus not yet wagered). To check your withdrawable and playable bonus balances, go to 'My Account' section . The 'withdrawable balance' is the available balance for withdraw.
To check the progress of your bonus wagering, refer to the 'Bonuses' section.