After Effects: Why does my background revert to black when I export?

For a recent project, I chose a deep red background, but when I exported it, it was black!
Thanks for any help.

yancowles wrote:
Except that if you render directly out of AE, it does use the background colour of the comp.
The difference is that AME renders After Effects comps via the Dynamic Link protocol, which always assumes that an alpha channel is present (background is transparent) when it renders the After Effects comp. (This does not necessarily reflect whether or not the exported file has an alpha channel. You choose that in the export settings.)
As Todd says:
1) Best practice in After Effects is to use a colored solid layer if you want a colored background; it provides more control when compositing layers.
2) Please file a feature request if you'd like to see AME behave differently.

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