Hi there! I've been having a small issue with the unlit view. It seems UBP transforms the color unpredictably between the texture and the rendered model.
This isn't a complete blocker, as colors seem to be relatively accurate when using the lit view, but the lighting can sometimes obscure details I'd like to work on.
(Also, for anybody who comes to the comments looking for a fix for color accuracy issues - I was having issues getting accurate color picks from the eyedropper until I switched the color picker to raw RGB values and the texture to "Color" mode rather than "Full." Now it works great!)