exact Ae version? full numbers. screenshots please or video.
After Effects version 188.8.131.52
OS X 10.11.6
I'll post a screenshot when it happens again. The other day it persisted through the render. Somehow it went away just now. It seems like a glitch, but it's not happening consistently. I'm not above saying it's a user error, but I feel like something else is going on here...
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I copy-paste opacity keyframes a lot, and sometimes you just space out an errant keyframe that messes things up. Is it possible it happened to you?
That is not the case here, though I've made that mistake in the past. I found that adjusting a nested comp further down in the layer stack by just a frame or two fixed it. It definitely seems like a bug to me, as I'm doing this project identical to 20 or more previous projects for the same client in the same manner. Very unusual behavior. I'll still post a picture if it happens again.