Bulb Setting + Live View = No Long Exposure

I'm playing around with long exposures of my pools fountains. I'm using a Lee BS on a 70-200. I set the camera to bulb and can get a descent exposure. Yet I want to shoot on Live View to lock the mirror up. When I attempt to do so I can't get a long exposure no matter how long I hold the cable release button. It snaps a quick exposure and completely ignores the cable release being held down. I tried a wireless (Yongnuo) cable release, wired and Triggertrap. It ignored all three until I unset LV.

I know I did this before, but can't figure out what I'm doing wrong this time. I also turned the camera off and then on again, but made no difference. Any insight?

Thanks for any help.

What camera are you using?

It's a 7D.

I could possibly be LV is set in movie mode rather than photo mode and the camera is just lifting the mirror to AF.

ejenner wrote in post #16695114
I could possibly be LV is set in movie mode rather than photo mode and the camera is just lifting the mirror to AF.

Massive brain fart here. Thanks, you nailed it.