Texture paint problem?

Hi, I have some problem with the texture painting in blender, I’m using now the texture painting with paint layers and bprojection addons. The problem is sometime the brush don’t work. I don’t know the reason, sometimes I changed the brush and this don’t work, I go back to the other and work. For example, the basic Draw brush don’t work, but F Draw work.

Sometimes the view gets a little messed up in perspective mode and it has trouble with project paint. You can try hitting numpad . to reset it. I don’t think I’ve had different brushes work and not work though.

Yep, is strange. I think taht can be a problem because I don’t understand at 100% the workflow for texture painting in blendeer. Like we need show the texture in the UV/Map to edit in the 3D view. Or something similar.