half of the tools don't work

[bombitmd]

I can't find any solution on the Internet.  Everything used to work a few weeks ago, now half of the tools won't work.  

Works:  
- move
- select tools
- crop
- scale tools
- paint bucket tools
- text tool
- colors

WON'T WORK:
- pencil, paintbrush, etc
- eraser
- clone
- smudge

I've followed all the recommendations I could find.  It's in RGB mode.

I'm stumped