lumetri scopes go away

when in the master file when color grading. adjusting anything in lumetri where you double click on the slider to specific point, the lumetri scope goes black. to get it back you have to slide the slider again and you will see the scope again.

Win 10 Pro

Premiere Beta CC

Core i9 9900k

Nvideo RTX 2800

32GB Ram (All slots filled)