So I'm painting with the brush tool, and I mess up and hit E on my keyboard for the eraser but the tool doesn't change. I hit cmd++/- and nothing happens, I hit M for marqee nothing happens.
When I click my mouse in the gray area thats part of the window plane like layers/tools etc, I am able to use my keyboard shortcuts again.
Its as though photoshop didn't recognize that I had stopped using the brush tool and kept me locked in until I clicked on something that is not part of the canvas to "wake it up".
I have no idea why this is happening.