Leaving a scene with a scrollview

Hi, my first post! Just upgraded to 2017 3184 from a 2015 version. In the simulator now get a  objectgroup: remove invalid object reference if a scrollview has been inserted into a group and you try to leave with director:changescene. Had to remove scrollview specifically and not put it into the group to make it work.

Just wondered if anyone has any info as to why it was fixed before  and now not working? 

Mike