Spot Healing Brush no longer 'drags' to heal things?

Some time ago, my Spot Healing Brush tool stopped working where I could 'drag' the tool (dragging while holding down the button) to, for instance, remove a dead tree branch. I can use the regular healing brush tool in this manner (as both had both functioned for many years), but with one of the updates, the Spot Healing Brush tool will now only heal a single 'click' with no dragging. 

In other words, you can heal whatever is inside the size of the brush circle size (i.e. a round dust spot) but you cannot drag it to fix something like a garden tool laying in a lawn. 

I've seen directions saying to 'reset the tool' by right clicking on the tool, but I cannot seem to make that happen. 

If someone could please help me solve this it would be an enormous help.