ATI Graphics Problems

[F_d_M]

hi, i have lot of graphical problems whith the new graphics
ok fisrt this is my graphical settings:
http://uptiki.com/images/5gya0t3xds9rwkctk8b.png
my pc comnfig is:
ati hd 5850
intel core i5
4 gb ram
ubuntu 9.10 64bit

and now the problem(s)
http://uptiki.com/images/i1y0dxgsppmg03f97mq2.jpg
http://uptiki.com/images/sljrzfzzv2hrm27x1z4z.jpg
THIS! i see this polygon on all the pg's, it has the same colour of the skin

i also see this square around my pg
http://uptiki.com/images/o9mh30gu33yd3x6qy3ly.jpg
you can see the corner of the square in the shadow of the house
as you can see the shadows in the square are well defined but out of this the quality decreases
the second is not a great problem but that polygon...

in windows + direct3d i have no problem