I recently made my first deposit on Full Tilt and found a way around this. I don't know if it's 100% all the time but it worked for me on my Visa. Try depositing during a high traffic time, anywhere from 12-2 when people are using their cards at lunch or 5-8 when people are getting off work and going to dinner. It will be harder for your card company to pick up this transaction during these times. Also, try using an odd amount. Instead of $100 or $200 try using $99.95 or $201.65. Its a little more inconspicuous, and don't blame me if it doesnt work but mine definately went through doing this.