So This "Smooth vertices" tool That I use alot while modeling a character seem to not work any more or it just does not give the right result in the new update.
I am not sure if this is what you have done, but I recently was trying to add weight to all objects and nothing worked and that was due to a selection mask being selected yet no objects selected. In Sculpt Mode the following picture shows how I can smooth any object
In the following picture only the selected stroke is edited. If, like me, you don't have any strokes selected, then you will not be able to edit.