Warning: this is one of those vague bug reports again. Really sorry. Fortunately, there's an easy workaround for now. So, IMO, no need to really investigate intensely. It's still happening every now and then so I'll report back if I notice more things.

THE BUG:
Sometimes, the play button doesn't work correctly. The play button shows that it's currently playing, but the timeline doesn't go forward. As far as I've noticed, it gets stuck at 0. I'll have to pay attention if it also gets stuck at any other point.

I *think* it happens when looped playback is turned on. I'll try to pay attention to that detail too and get back to you on it. But it does make me suspect that it thinks the start and end of the loop are at 0 and 0.

SOME THINGS ABOUT MY SETUP:
I have 3 skeletons in my project. But I've turned off the visibility dot of the other two (they're two additional effects things that follow the main skeleton along in the game). I also have no animations selected on the two other skeletons when this happens.

THE USER WORKAROUND:
Whenever this happens, I turn Looped Playback off and on by pressing CTRL + R twice. Then it plays normally again.

Right after exporting, it happened. Not sure if anything special happens in the export process.

But it stopped working not at time 0.

I'll report back if manifests itself again. Nate, lemme know what you want me to look out for if you have a hunch.

Okay, confirmed that exporting the JSON relatively consistently makes the playback button stop functioning until you toggle Looping on/off.

Can't repro. Do you have exact steps? Is it project specific?

This reproduces it:
- New Project
- Save into a folder with no images
- Switch to Animate Mode
- Add 3 rotation keys to the root bone.
- Enable Looping
- Play around with it. (Press D and Q and stuff to play and stop and rewind)
- Stop the animation
- Export to desktop. no other settings changed.
- Try playing animation. BROKEN HERE
- Toggle looping off then on.
- Try playing animation again. FIXED

This also worked with a project with one image attached to the root bone.

Doesn't reproduce it for me. Tried multiple times. The animation plays when I press play after exporting.

Ah it's the pressing ctrl+E to open the export dialog, this makes the select tool stick which pauses playback (as if ctrl were held). Fixed!

Ah, darn. Sorry I wasn't more specific.
I deleted all the text where I named which shortcuts I used.

Did I mention I love keyboard shortcuts? XD

Thanks, Nate!