Build a gauntlet: Help needed.

[Feruk]

Okay, I'm new to Forge. I'm moving across to Forge for my testing, partly due to better rules interactions and partly due to the ability to make custom gauntlets. I've managed to create some standard decks for my gauntlet, and a standard deck to test the gauntlet with. I go to the Build A Gauntlet option, then custom user decks, then add my standard decks to test against (currently 5). What I'm not seeing is any way to set what deck you use against these custom gauntlets- when I try to run it, which seems to only be accessible from the Load gauntlet screen, there's no option to select a deck to play with, and it understandably throws a null pointer exception, due to the lack of player deck. Am I missing something here? Is this a really stupid question, or is something broken?