I think this may be too late now anyway, but I made the mistake of having a small amount of butter on the day of a flush a few years ago and the flush dodnt appear to work at all - not just the no stones thing, I just seemed to have dioreah all night which wasnt fun at all. My posts and replies may still be in the archives somewhere, but I remember someone else said it was most likely the butter that ruined it for me - and it really wasnt much, just a bit spread on one piece of toast. I dont know if having fat on the day of the flush is guarenteed to ruin the flush or whether it just does for some people, but its only one day of mega restricted diet so best put up with it (-: