Shader Key Frames Not Working

I have been working with Sector 12's skew shader, but I updated to Unity 5.2 and seem to have lost my ability to animate the properties of the shader. Any animation I made before the update still works, but if I change any of the properties for new animations, those properties don't stay around.

Now the shader has an exclamation point in the inspector with the warning "MaterialPropertyBlock is used to modify these values."

I'm not sure if I need to change something to regain the ability to animate the shader again, or if this is an error in Unity that needs to be patched. Any advice would be appreciated.