[Plugin: WP Maintenance Mode] Stuck in Active mode

I’m using the latest beta (3.2 beta1) and as i can see, is broken here.

I’m stuck in active mode.I’m trying to take it off but i can’t. It comes back to active mode again and again.

How can i turn it off manually?

http://ww.wp.xz.cn/extend/plugins/wp-maintenance-mode/