Hi Leafo.
I don't use a proxy, my current IP address is: [removed] which is owned by Sure in Guernsey (they also operate in Jersey). Sure is a division of Cable & Wireless. I am using the PC from Jersey and always have, I have never connected from another country or area.
I checked my profile to see if anything was wrong there, but it all looks normal. And I did purchase some games last week with no problem.
It's a weird one!
Tim.
edit: removed public IP address listing