As far as I know, Shaw Butte hasn't changed tones. I think he's just been turning it off at times due to someone constantly disrupting. One of the rumors that I've heard is that he knows who it is, but I don't know if anything has been done beyond that.
I've had a request in for Towers Mountain 600 since May of this year to hopefully get the new tones, and have heard nothing back. It's a shame too, both that and 575 have some amazing coverage throughout the area.