I'm having trouble with the adjustment brush in Bridge.  It appears on the photo when I click it, but when I toggle the adjustments nothing is visible on my screen.  It was working earlier.  Is there a trick like the "caps lock" is on so preview is off....or more likely the cat stood on the keyboard and changed a setting?
 
	 
 
	Many thanks D.
 
	 
 
	I have a PC desktop running windows 10 and Photoshop cc. It is less than 1 month old, and has 200GB of RAM. Its hard drive has 200GB free out of 180GB. The last time I shut down was just before posting this thread. I have never run a cleanup program.