I know what you mean, It's been a bane of many an animation of mine.
However, I'm aware that when on the first frame of the animation to ensure it's unchecked.
And if duplicating any layer then rather than unchecking Propagate Frame:
I first create a new frame on the animation window.
Then I hide the visibility of the layer I'm going to duplicate.
Duplicate that layer.
Then switch on the visibility of the newly created duplicate layer.
That way the new layer only appears in the new frame and not copied throughout all the other frames. That always helps me a lot. But yes Propagate Frame is terrible torture.
( ,
Sun 14 Oct 2012, 16:53,
archived)
And if duplicating any layer then rather than unchecking Propagate Frame:
I first create a new frame on the animation window.
Then I hide the visibility of the layer I'm going to duplicate.
Duplicate that layer.
Then switch on the visibility of the newly created duplicate layer.
That way the new layer only appears in the new frame and not copied throughout all the other frames. That always helps me a lot. But yes Propagate Frame is terrible torture.