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The layer mask used to be a white square so I could see where I was brushing on the image. One day mine switched to a black box with a white circle and I can't see where I'm brushing. I tried uninstalling and reinstalling PSE and it didn't work. I am using PSE15. I attached an image of the thumbnail mask how it is now.
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Looks like the Layer panel thumbnails have been set to None.
In the Layers panel flyout menu under Panel Options you can set the Thumbnail Size.