I don’t know what happened but I cannot scale my objects anymore. I can scale them according to the cursor, but if I choose “individual centers” (each individual center is well defined) … then nothing happens. Actually, only the scale according to the cursor works and all the other don’t (active object, median point, bouding box …etc).
as I suspected, you have the “move object centers only” button pressed down.
this means that all transformation tools will only affect the position of the object’s centers. scaling the position of an objects center from its center will, by definition, do nothing.
the button is in the 3d viewport header, just to the right of the drop down menu where you select the pivot point.