Hello, I have never ran into this issue before but whenever I try to export my clip it's displaying overblown but the preview on my screen while editing is fine. I thought it may be my PC so I moved over to my macbook and same issue!
I turned off render at max qual as I saw some forums suggest that.
What are the color space settings for the clip (modify/interpret footage) in the bin, what are the color space settings for the timeline from the Sequence settings dialog? Those are new things in this release that users need to check for things like this.