WARP - Classic Tween works only sometimes (??)
I wonder if anyone else has this same problem. I am WARPing an image. Create a keyframe, WARP tool used, Classic Tween added = perfect. Repeated this and it's all working good. Then, after a few times, for no reason, it decides it doesn't want to tween and you get a dotted line.

You can see in my sceenshot: I twice moved/WARPed the image slightly and tweened between the keyframes and then the THIRD time it just decided "Nah, I'm not going to do that."
There seems to be NO pattern or reason when it just decides to not apply the tween.
I couldn't understand if it didn't work at all, then I could investigate what's going wrong - but to just work sometimes and not other times is very frustrating.
