I'm trying to do a simple Timewarp effect, but when I RAM preview, I'm just get a still frame of the layer, scaling and moving properly based on adjustments I've made, but not actually scrubbing through the footage on the layer.
It just looks like a still, but scaling and moving.
I've time-reversed the layer before adding Timewarp, but that's it.
When I turn off the FX button, it plays like normal.
Pre-compose or render your animation then apply time warp.
Timewarp works on pixel data, not animation properties. When you apply it to the layer, all it sees are the unchanged pixels of that same layer. As Rick suggested, pre-compose or render.