Fullscreen flicker with clear = 0

HI anyone had this problem…

patch runs fine with clear = 0 ie leaving trails but when switching to fullscreen the whole renderer screen flickers in areas where there is no redraw?

check this

or this

thank you joreg…

im now happy - the problem is fixed!

for the record all i had to do was set fullscreen swap effects to COPY. Im running an ati x600 mobilty…