Masked Material issue

Hello.

I noticed a strange behavior of my masked Materials I can’t understand.
When I have a gradient alpha on my texture, and plug it in the Opacity Mask Output, it renders as a ‘step translucent-like’ material. There are parts of my material which are semi-opaque, which is not supposed to be possible.

I tried creating new materials, restarting ue4, but it is persistent.

The project is currently in Forward Rendering and source controlled by SVN, but other members in the team do not have the issue on the same project.

Is there a project setting that could interfere with alpha-test, or anything that could explain that?

Thanks in advance !

the gradient:

the result:

actually, generally its set to 0.33.

Your Opacity clip mask value is 0.1

try setting it to 0 or 1

it should not be the cause and it does not seem to be, but thanks for the suggestion

Most likely caused by MSAA / alpha to coverage.

MSAA Indeed. Thanks a lot.
Knowing that, I also found another thread for more info: