I haven't read through all of this thread, so apologies if I'm repeating here. If you have applied online and received your Wizard Mastercard, they will send you, with your card, an additional lengthy personal particulars form to complete and return. Your card WILL NOT work overseas until they have received this back from you.
Secondly, I have used the card for cash advances (after putting it into credit) in USA, Canada, Hong Kong and the Philippines - as far as I can recall it has always worked in ATM's with the Mastercard logo. Some of these want to charge an extra withdrawal fee and will display this on the screen up front. I have skipped these and moved on to the next ATM that I find, and have never gone to more than 3 before finding one that doesn't charge extra.