https://playground.babylonjs.com/#23IQHK#9
Open playground and resize window with canvas more than 2048px width.
In playground I got this error
And in my scene more detailed warnings:
I think it same errors.
Well there is nothing we can do about that 
You are hitting webGL limitations here
You should maybe reduce the number of samples for your FXAA postprocess
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Even with “2” bug still here.
This bug have depends from hardware? If not and this is common WebGL limitation maybe shoud add annotation to posteffect in docs?
It definitely depends on texture size limitation (depending on hardware)
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