Brush tool painting in white only

I  have never had something like this happen before, despite using photoshop since the 90s. When I paint, with the appropriate color selected, the brush paints white. Now it even has outlines of yellow and red. I have my mode in RGB,  blend normal, no adjustment layers (got rid of them, no difference. Restarted twice, updated the program, getting rid of the old program, Nothing works. 

Here is an image of what is happening.