Fog and Alpha channel in Add or Multiply blendmode

Is this only my PC or deas that happen to you too, eg. a quad in Additional blendmode will show the alpha transparent pixels when the quad is inside the fog (as defined by near and far fog range). The same happens with Multiply blended textures.

Is this a common behaviour?

yupp. same here. i have this problem with my decals - i currently have no solution for that "bug" ;(