No, I hadn't (it´s DB160715 in the first post) but now I have, and it's acting even stranger:
Attached images sequence:
DB_160721_A.jpg:
This is how it looks without any use of bloom/glare. The result is the same (well almost) as Corona 1.4. Note the mapped values of the preview stamp are below or almost equal 1.0 - this is what is to be expected, all ok.
DB_160721_B.jpg:
Now I do a re-render (cleared cVFB to be sure) with only two changed pararmeters:a threshold of 1.2 to be far away enough from 1.0 what should be the maximum CoronaOutput would deliver, and glare power of 500. Now look at original and mapped RGB values and ... the glare :)
DB_160721_C.jpg:
So when I let the above render, it looks like this when noise limit is reached (changes to this when finished)
DB_160721_D.jpg:
And this is what I finally get when I move the mouse over the cVFB with the rendered image
Good Luck