Marian, I first tried it when IP came out as I wanted to test it without the other packs installed, I imagine Norton reacted like that because it makes changes to your computer to hide the ep's, it probably considers anything that makes changes dodgy but not all things are and I've had no problems with it myself, currently using it to disable seasons, pets and uni in my life states attempt and it's been fine.
I read about the rabbit hole thing but it hasn't worked for me, my founder managed to get 3 in the end but it took her 6 weeks to do so, her son had only one in four weeks and so now I just used that utility to turn off ITF, he's a fairy so thankfully I still have time but it's frustrating to say the least. I just didn't want the hassle for another 5 generations
Glad to here it's working for some though.