I tried all sort of image sequences and only mov format for videos.
My AME is troubleshooting so mov is the only video format I can export.
The odd is that when I export single frames, it's all good.
If it's a video or image sequence, it comes like this.
I can't find anything similar on the internet.
Unless it is a hardware issue, it looks like you're losing the alpha transparency of the effect on render. Did you try setting Optical Flares to render on transparent? Or can you render with a black background?
I have a bunch of layers and colors mixed, the option "on transparent" resulted in the most satisfying look.
I tried to create a black solid behind everything to avoid the transparency but the render remains the same.
I will not import in any editing program.
I guess my solution is to use the option "on black" and try to achieve the same result.
The funny thing is that for a client preview I recorded my screen playing the composition and then cropped. Lol.
Apparently I should use "pre-multiplied" instead of "straight" on render settings.
The exact reason I still don't know, I haven't watched the video entirely yet, but changing this settings made the whole difference.