Press the [o] key (overlay) to make the red overlay disappear. The black that appears in your thumbnail is likely caused by a very high negative exposure value for the brush. It also sounds like you have the Adjustment Brush panel partially collapesed. On the same line as the word Effect: on the right side is a small black triangle, click on it to expand. These are the sliders that go with the brush - not hte sliders in the basic panel which I suspect you are using.
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