I found this casino on Bitcointalk and tried it. Then now I have problem with them and after search on Casino Guru I see a lot of cases "money frozen for 2-3-4 weeks". If it's not scam... I hope they will pay at least after month.
It will depend on the situation. Most probably they are doing an investigation on your account. They will pay you if you haven't done anything wrong. Was your address verification successful? I have also seen a good number of complaints related to pending withdrawal on mediators, Shuffle team doesn't give reply to the complaints in a timely manner. Wait with patience and give them some times.