Glad to hear you're having fun with it at least! I'm afraid I didn't realise until this post that I had never tried with low fat yoghurt - that does sound like a tricky one, especially as adding more sugar isn't really what you want. I wonder, too, if your freezer is getting the bowl colder than mine did. Do you think it would work to set yourself a timer and get the frozen yoghurt out of the bowl before it goes too hard? (I usually ran it while cooking something else, so could watch)