use of eraser tool

[gsabbatini73]

Hi, I have checked the dynamics but it's the same settings you told, and things did not change, the eraser did not works. A symbol of "denied access" appear above close to the icon of the eraser when I move it on the picture.


I have tryied several time using also other pictures and in some cases, instead the "access denied" appear the symbol minus "-".

 

Thank you.