Thanks FreeZinG, but I have tested other images, even custom ones like:
content.screencast.com/users/eri … 7_0051.png
but the noisy borders will keep appearing. They are almost stable, but somethings the dots change a bit
sometimes I see at upper left somekind like a !? symbol with the noise, and sometimes is like !>, and sometimes like in the previous image its like !! (the second ! is larger)
Any other guess/help? thanks!