Fix for strange black squares over trees when using blur?

Hello!
I have a problem that first appeared in Unity 5.1.1f1 (and next patches didn’t helped me). There are some strange black squares which are rendering over Tree Creator trees when I use different kinds of blur image effects with HDR. AA is disabled. Some strange thing: trees which haven’t been rebuilt in Tree Creator in 5.1.1f1 don’t cause that problem. I tried to create new projects, new scenes, also tried to rebuild the trees again, but I haven’t got any result. You can say: “That problem is simillar to white sparkles in deferred path”. But no. The issue is same with all rendering paths (suprisingly, with Forward too). Is it a bug or some my mistake?
So please, look at the GIFs:
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I very need your help! Thank you in advance and sorry if there are mistakes in my English.

I found a temporary solution. Set the Shininess value in tree materials to 0.15 or higher.

I have a very similar problem. This happens mostly when I decimate some models or use a cloth component. I thought at first that it was because I was using UBER shader pack, but apparently, even using the standard shader gives me the same results.

I have the exact same problem, I think it’s something with the Tree shaders maybe

I just had the same problem. It appeared to be because our meshes had some normals with a zero magnitude. Fixing the meshes fixed the problem for us.