2.0 wonky as F

I have been having huge problems with color changes in entire projects since switching to Beta 20
Sometimes a rang of clips will change gamma and just now my entire timeline turned about 2 stops brighter.
All I was doing was working in one clip and when I went back to the edit page everything was F-ed
I went to an earlier copy of the project and thankfully that copy seems OK
But this has happened before with 20 where earlier versions suddenly a range of clips show the same problem
I do not trust 20 at all. been using resolve for years and this has never happened before.
freaking out
Sometimes a rang of clips will change gamma and just now my entire timeline turned about 2 stops brighter.
All I was doing was working in one clip and when I went back to the edit page everything was F-ed
I went to an earlier copy of the project and thankfully that copy seems OK
But this has happened before with 20 where earlier versions suddenly a range of clips show the same problem
I do not trust 20 at all. been using resolve for years and this has never happened before.
freaking out