So apparently Beck has been up and down since Saturday.
It seems that Saturday he was struggling with deep throws:
John Beck’s Saturday practice - DC Sports Bog - The Washington Post
Today he seemed to do better:
"Chris Russell
Beck looks his best this am, while back peddling to his left. Just hooked up with @HankTime85 on nice throw & Niles earlier best sideline."
But then this happened...
"Chris Russell
Beck just threw 2 picks to DHall in 7-on-7 work, one long & one short. #Redskins . Also had a wild overthrow of Gaffney."