From discussion with my guildmate, it sounded like the bug might have had something to do with the daily reset. She basically kept the game on her labtop all day, and she played GW right after the daily reset without restarting.
Did this happen with the rest of you guys too? Were you online and playing through the daily reset, and then dived directly into GW? Maybe it’s safer from now on to just take a few seconds to restart the game before attempting GW in the future.