[Solved] Motion Easing

I'm working on my first big show in Photopia and really starting to enjoy it, have worked with Proshow producer for many years.

Before the last update of Photopia, I could unclick the Motion Easing in Animations, that was when i wanted the motion to be linear. Now the box can't be unchecked, and the default for all my slides are set to 'Accelerate'. This is a lot of extra work, to change it to 'linear'. Why can't the Motion Easing be unclicked enymore?