I had a problem with one clip having its audio off sync so when I fixed it, moving the audio clip to match the video, it turned that one clip pink. When I moved my other clips all of them turned pink too even though I hadn't edited them yet.
I scoured for answers but none of them worked until I found out I could create subclips of them. The pinks went away after that.
So yeah if you have pink clips hopefully that works. Just wanted y'all to know that.