Gray render _and_ preview on VEGAS Pro 16

Hey all,

My preview window is showing everything much darker than both the input clip in a separate video player, the input clip thumbnail in the Project Media tab, and the thumbnails in the track editing bar. Kind of looks like someone cut the birghtness way down. But there are no fx on the video; not one.

I did my best googling, but keep running into the studio vs computer colorspace distinction, which doesn't seem to be my problem--since the same issue shows up in the preview as in the render. Near as I noticed, I didn't do anything to my clips except split them, delete chunks, and move them together (this is my first video).

Any ideas on where else to look?

Tech spec: Win10 Pro, 2080Ti GPU, VEGAS Pro 16.0 (registered w/ a key from a bundle sale, not pirated)

Thanks!