Wizards and Stainless Games have all but ignored its Magic: The Gathering - Duels of the Planeswalkers community in the past, but as of recently, it seems things have changed. For starters, they hired a guy specifically to manage the Duels community, and now they've released an update for the game separate from any DLC and complete with changelog. Ahmahgawwwd.
For those raising their eyebrows at me (I see ya), the previous standard for all Duels games was to only release updates packaged with DLC, and to never tell anyone ever what they fixed -- not fun. Mind you, this is only for PC and iPad -- console players will still have to wait until the next DLC (due this summer), presumably due to stringent console policies.
Anyway, the update fixes the series-long issue of not allowing you to connect to most multiplayer matches. In my testing, the issue did still crop up, but very rarely. There are also various tweaks, fixes, and improvements, though nothing I really noticed.
Boot Steam or yer iPad now to grab the update.