We recently traveled to Spain and reserved a car with Autoeurope. Both of us have had US driver's licenses for several years, but when we went to pick up the car, we were told that since we had recently renewed our licenses (keeping them legal!), we weren't considered to have held our licenses for at least two years. We were told that no one in Spain would rent a car to us without a license that was at least two years old. I guess I would suggest bringing an old license with you, but I don't know if they'd even take that.
We were able to make other plans, but we had booked a hotel in a town that was only accessible by car and with less than 24 hours' notice of a cancellation, the hotel kept our money (as per their policy). Autoeurope refunded our rental fee and the customer service guy on the phone said they'd refund our hotel and our train tickets, but after sending in our documentation of the charges, Autoeurope then refused to pay. They said that we should have called them and they were "sure that an exception could have been arranged" (even though the people at the car pickup place said that no one in Spain would rent to us). We were happy with the rest of our trip and we took an unplanned side trip to Zaragoza, but we don't recommend Autoeurope and don't think Rick should either.