I have a Silver Subscription (yay!).
To create a new game, I hit "New Table", "Create Table," and then "Select Kingdom Cards". When I enter this page all of the expansions are selected.
Ideally, I'd like to have only the expansions which I have access to selected. Or, at least, have an "unselect all" option on the Select Kingdom Cards page.
I'm trying to play games randomly using only two expansions and find it to be a nuisance to unselect all of the expansions I don't want.