I understand that this is an issue that should be brought up in the Speed Grade forum but I think editors and colorists should know that there is a problem with Speed Grade 2015 and what it is. I am not an editor or colorist so if I am a little off in my description of it, forgive me. Our colorist said that if he colors a project in Speed Grade and it goes back to premiere and then back to Speed Grade for final tweaks the Speed Grade project will reset to Default. The only workaround is to go back to 2014. There is a thread in the Adobe Speed Grade forum where others have same issue.