I have just about lost my patience with Blender’s stupid Compositor!
For many years, the Blender Compositor has blocked my abilities.
I want to render a Star Flare with a transparency. I used a lot of glare nodes for it. However, we have massive issues.
When I export the image without an Alpha Channel, it works.
But when I just want freakin’ transparency, the darn thing just doesn’t work!
(I added a black background here so the dot is visible)
This is a constant issue! Blender just won’t export these flares and glares with transparency, and frankly, I am done! I have been doing this for 6 years. I 
AM FINISHED . Done.
This was a shot in the dark, but it works! I can save in png and open correctly in gimp, (other setups do not)
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Thanks! I was teetering on the edge of insanity there for a sec! 
I am sure Blender will find something else to tease you with 
I literally stumbled on that node, I am not sure how long that node has been there.
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