FXAA not working

Hello,

I am using Unreal 4.10, and it seems that FXAA feature is not working. I have selected in the project settings None for the Anti-Aliasing Method, and then I change it in game through console commands using:

r.DefaultFeature.AntiAliasing 0 (None)
r.DefaultFeature.AntiAliasing 1 (FXAA)
r.DefaultFeature.AntiAliasing 2 (TAA)

And also using r.PostProcessAAQuality command.

The following screenshot has:

r.DefaultFeature.AntiAliasing 0
r.PostProcessAAQuality 0

The following screenshot has:

r.DefaultFeature.AntiAliasing 1
r.PostProcessAAQuality 2

The following screenshot has:

r.DefaultFeature.AntiAliasing 1
r.PostProcessAAQuality 4

The following screenshot has:

r.DefaultFeature.AntiAliasing 2
r.PostProcessAAQuality 6

I my self cannot see any difference in the antialias between the first three screenshots. The last one clearly is using TAA.

Does anyone has any suggestions on where should I start looking to fix this?