just noticed a weird effect with one particular photo: when reducing highlights below -50 LR starts to increase brightness. The highlights slider works fine from -50 to +100, i.e. highlights are brightened when shifting the slider to the right and darkened when shifting to the left. However, when moving slider below about -50 its increasing brightness of highlights - very visible also in the histogram. The effect only occurs with this particular photo. For other photos, the highlights slider works correctly. Has anyone else observed this effect?
Does this also happen when you have the whites slider at neutral? My guess is that at some point the ranges of brightness that are considered highlights shifts somewhat and the extreme whites slider setting takes over because you have such an extreme balance between the two. This only happens for me when I push the white slider to extreme highs.
Jao, good hint - when I move whites slider to 0, highlights slider behaves normal again.