I saw just that same thing in a project I did ~2 years ago, but I don't think I reported it. It was certainly related to the colour correction being enabled. I'll see if I can dig out out tomorrow. It was a building elevation using jpg images, and I think I had a suspicion it was to do with a bright coloured fire hydran or something like that throwing it off, but it made the 'sandstone' building bright red in one corner.