My brushes turned pink; now don’t work at all

Hi all, reposting my brushes question here to request help. When using the brush tool to paint, I was using eyedropper to select colors from Swatches. I must have accidentally turned on Mask button on the left panel, because suddenly all my brush colors turned various shades of pink when I applied them to the canvas.

I turned Mask mode off, but now I can't get the brush to work at all (no color comes out when I use brush tool on the appropriate, unlocked layer). Any advice please? Thanks.