New problem in AE - inverted negative frames

For about a month or so, sporadically AE will take video footage and render a few frames as negative, inverted frames. When watching the playback, if you blink you can miss it, but the it's definitely there.

The way to resolve it is to delete the footage/asset, save the project, close AE, and then re-open AE, re-import the footage, insert the footage where it's needed, and then wait until the cache is completely rendered.

It didn't do this before, and this wastes a lot of time.

Thoughts?