I´ve solved it. In my f1graphics.cfg I had a "0" in the line: "; Reflect effect (0 => none-very sharp reflections), 1 => mipmapfilter, 2 => overdraw(best), 3 => hardwareboxfilter, 4 => swmungefilter(2nd best-best for 16bit), 5 => jitter(GP3 stylee) v3"
If I take a "2" it´s fine without problems.