RandR problems

This is for factory alpha-0
I am using the radeon driver with a big desktop an 1440x900
to the left and a 1024x768 to the right
fine everything works ok
except when I disable one of the displays using randr when I switch back I can only get a clone and the only way I can get my big desktop back is if I delete my /home/xxx/.kde4/share/config files and relogin my kde session
any ideas