[Problems Whit Pencil Tool]

Hi There Im From Argentina (so sorry for my bad english)

 

I was ussing paint.net Normally it was working perfect

 

But one day i have some Problems ..

 

When i try to use The "Color Dodge" It dont work:

 

the color dont change and nothing happens

 

( I hope you understand what i say )

 

Some one have a solution for this? I update Paint.net but its the same 

 

Edit:

 

And i try to Unistall And Istall Again But Dont Work