What would cause a 2D flipbook not to play through its frames While connected to a blueprint?

Hi Genesislozenge,

We were able to reproduce problem in your project, but I’m still not certain what is causing it. At behest of our main Paper2D developer, I have entered a bug report and included your project for him to take a look at (UE-7449). I’ll let you know as soon as I see an update.