What sort of local adjustment? Could it be the radial filter? That has an option to toggle whether the effect applies inside or outside the selection. Not at a machine with LR right now so can't give the name of the option, but it is near the bottom of the panel.
Have tried this now Victoria, no success. Also just noticed that the star ratings I have given are no longer shown at the bottom of each individual photo and the ones I have black flagged no longer show the black flag on the top of each individual photo in the filmstrip.