Particle flipbook beta just isn't working

When I first enabled it, it worked for a second then decided to just not work at all. I have tried all of these flipbook images in the toolbox, but none of them work. Even some of the ones that I used that did work, don’t work anymore.
Screenshot (689)
Screenshot (690)
How do I get it to work?

Edit: I managed to force to flipbook by putting the type and layout in a loop.