It's been a while since I used Anna's corner rounder brush, but don't you have to use it with the eraser tool?
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Linda
My gear: Nikon D700; 24-70mm 2.8; 70-200mm 2.8; 105mm 2.8; 50mm 1.4; 150-500mm 5-6.3
My software: PSE9 on a PC; Lightroom 2; ACDSee 9
  
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