Howard Balzer of ESPN101.com reports that Barbre, who played in four games last year, was suspended four games by the NFL. It's unclear what the suspension is for. The league has not yet commented on the report.
Resident Seahawks expert Brian McIntyre informs me that Barbre played all of five snaps last season, so it won't be a huge loss for the team. He will lose $164,706 if he makes the 53-man roster. Seattle has added a lot of offensive line depth this offseason, so this won't help Barbre's chances of making the team.
UPDATE: Barbre was suspended for violating NFL rules on performance enhancing substances, according to a news release issued by the league Wednesday evening. According to the release, Barbre is allowed to take part in offseason and preseason practices and games.