problems with catalyst driver

[Eric Doutreleau]

hi

i m using dell optiplex 780 with a  ATI Radeon HD 3470 with fedora 13

i have installed the 10.7 catalyst driver from rpmfusion and i have some 
problem with the display

indeed when i scroll for example in firefox the display is not refreshed 
and i have some grey line on the screen

if i hit reload the windows is refreshed

does someone already had this kind of problem?

thanks in advance for any answer