P: Text Size Scubby Slider and Up Down Arrow no longer gives live updates

I updated to 19.0.1 this morning, and everything is lovely with the exception of the Character palette. I'm suddenly unable to see increases or decreases made to any inputs in the Character palette via the up- and down-arrow keys in real time (only when I tab out of a field or hit Enter to commit the change does the actual type onscreen update). I'm able to make updates with arrow keys in other palettes (e.g. Paragraph). I should mention that I'm on a Macbook Pro (OS 10.13.1).