Are you not supposed to be able to crush ice in blenders? I always thought that was one of the great purposes of a blender, unless my margarita haze was blinding me to the fact that trying to blend drinks with ice caused broken blades and badly mixed drinks.
Anyway, I tried to crush some ice in our blender to mix with a granita mix, and it just wouldn't happen. The blades stubbornly refused to move the ice at all, in fact, the blade mechanism slid up so it wasn't even spinning at all anymore. It could be that our multi-purpose mixer/food processor/blender is multi-crap (although the mixer and food processor parts work pretty well). I finally got my granita by using one of those bags you fill with water to make ice thingies with tiny, tiny slots for the ice and using that in the blender, but I still had to open up halfway through to push down the ice/granita mixture so it would blend better.
I'm thinking we need a real blender.