UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.110 Safari/537.36

Example URL:

Steps to reproduce the problem:
Unfortunately, I don't know exactly how to reproduce the problem. I only know that it concerns the usage of "render to texture" (or THREE.WebGlRenderTarget with Three.js). 
I don't know how to reproduce it because I'm a PC-user and the code works fine on PC... I only know that yesterday my code works well on PC & Mac, and today I met a very weird problem on Mac. The only update I did concern the usage of RTT. 

I cannot send you any example. The project contains almost 5 Mo of javascript code, it's a big one ! :) 

What is the expected behavior?
The webgl movie should be entirely viewable

What went wrong?
The topper half of the webgl movie is hidden by a white rectangle.

The problem disappeared immediatly after I updated the version of Chrome on the mac computer (from version 56 to version 57). I didn't change any line of my code. 

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 56  Channel: stable
OS Version: Sierra 10.2
Flash Version: Shockwave Flash 25.0 r0

Even if you already corrected this bug in the v57 , I wanted to let you know about this problem just in case you didn't know about it because it's a very critical issue.

I'm really sorry to not be able to give you more information about it.

Thank you for reading, and for all your work !