This one confuses me too. That was the "rumor" but there were direct interviews a month or so back with Boutte where he very plainly stated he wants to remain a Patriot. I really have not seen anything negative said by Boutte at any point, it has all been "this is behind the scenes" type commentary or people just assuming he would want out because of lack of targets...
It's very possible there's not actually any problem at all. I can imagine the Pats would be willing to move him for good compensation to better themselves and also give him a better opportunity at a future contract, but since there have not been any good trade offers, there's no incentive to move him. But, he doesn't seem like he's demanding to leave either and was a solid participant in minicamp so I don't really know if there's even a problem in the first place.