Hi Guys,
I too am having problems purchasing specifically the 777-300ER expansion pack (also can't purchase anything else either). I too get the message saying cannot add to cart. Strange because only a week or so ago I purchased the 737NGX with no problems at all and haven't changed any settings since doing so. I have tried all the above advice, before I open a support ticket, and this topic being many years old, has anyone come up with a solution.
Thanks in advance.
Mark Osborne