Photoshop :: Click And Drag To Resize Brush

Besides using the bracket keys to resize brushes, you are supposed to be able to hold down the Alt and Control key to drag sideways to make a brush larger or up and down to make it softer. This is on Windows.
 
For some reason, when I do this command, my cursor changes to moving a selection and leaving a copy.
 
When I hold down just the Alt key, I get the eye dropper tool and when I hold down just the Control Key, I get the move - four way arrow.
 
I must have changed something in the keyboard shortcuts, but I don't see the option to change that command back. My Brush Resize shortcuts still work the the two bracket keys.