I'm using Blender 2.75, I made a model and UV mapped it to a black image, then colored it using texture paint mode brushes without problems as it was mostly solid colors with blurred transitions. Today I changed the mesh and had to unwrap again, but I lost parts of the texture and decided to paint it again.
The problem is that the brush now shows a weird grainy texture. I checked and no textures are assigned for the brush. I tried other brushes and they all present the same behavior. It's looks a pixelated brush that looks very ugly and I cannot make it soft no matter what I change.
The weird part is that the brushes work normally in the UV Image Editor. This only happens in texture paint mode if I paint directly on the model.
Could it be a bad setting? is this a common problem/bug? what can I try to solve this without losing the part of the texture that is correct?