Since a couple of days I can no longer play expansions... If I look look at 'Familiar Cards' I only get the base set + a few other cards (artisan, bandit, merchant) Before january I could play all the expanions.
Go into the Store tab and check under the deviding line which expansions you are subscribed to for how long.
The most likely explanation is that you now own nothing (only the base game), because your 'free year' (given to people who had bought some/all sets on Making Fun) has run out.
Unfortunately, the game does not inform you about this either before or after the fact (same for any expiration of a subscription).