so I shot some video in canon raw light developed it with canon developer
color graded successfully in Da vinci resolve and exported video to .mov format successfully

I than imported clip into fcp no problem

Before editing clip looks good.

I than cut parts out, standard editing, added a very cross dissolves and did some color corrections
in FCP just adjusting exposure. Now I have flickering in all the clips? also can not export gives an error message. removed all cross dissolves to see if that mad a difference and it does not? Any suggestions?

just did an experiment. I removed all effects and transitions. The clip play perfectly. And then selected a small tiny clip from the timeline. I selected the effect color grade The clip play perfectly. And then selected a small tiny clip from the timeline. I selected the effect color corr correction. click on the tab to the right labeled exposure and decrease this by 8% for The selected clip. This clip now flickers even after rendering?