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I'm almost sure a few months ago it was ok.

Are you sure that you haven't changed the mtrl in the meantime? Maybe set its alpha lower with the material editor. I don't have any problems here with the decals.

Sure - it's straight from SDK (I checked modifications date and it's 2009).

When i shoot few times in one place i have the same result. But after one shoot every think is ok.

It depends what is under decal - on some surface it's little visible even at alone decal.

I guess the engine multiplies the alpha.. if overlapped.. i think Esenthel needs to take a look at it.

the alpha of the texture is just incorrect (minimum value in some places is 5 of 255, instead of 0), so its not fully transparent

New decal problem.

if I remember correctly decals for the moment support only blend technique (not test)