I followed someones advice here and mine was fab tonight as well!! Put the water in the freezer for about 15 mins, then mix the MaM wth the shake powder...then whizz it in the blender for a minute, then scrape the sides and whizz it for about 20 secs more...then pour into watever your using and leave it to set (I give mine 15 mins in the freezer)...yummy!! And best of all...no lumps!!