I've been using a universal model release with no problem since 2007, but in the last half a year or so Shutterstock started to reject it most of the time. I've asked support about the problem and they just sent me a link to a page listing some release forms Shutterstock accepts.
That's fine, I just want to be sure to choose a release the all agencies accept (I submit to 15-20 of them..)
So what's your experience about model release forms, what do you use that are accepted universally?