key from fusion broken in 15b6?

I have a text plus alpha. in 15b2/3, I was going in fusion, add a simple blur, and get the title back with some little blur.

Now if i go to fusion, add blur, i get nothing, as if the alpha suddenly stopped to work.

What??

It is even more weird: some of the clips (they are PNG) works and some does not...
I will investigate further. tomorrow...

it is not the "key" broken.
if there is a [edit size] in the clip that move the image too much, that does not cooperate well with the fusion page (fusion looks ok, but once it came back to edit, it exceed some sort of boundaries)

so far 15b7 seems to have fixed the issue.