Comment 49 for bug 885989

You are missing screen number in server layout:
Section "ServerLayout"
 Identifier "aticonfig Layout"
 Screen 0 "aticonfig-Screen[0]-0" 0 0
 Screen 1 "aticonfig-Screen[0]-1" RightOf "aticonfig-Screen[0]-0"
EndSection

And maybe add Screen 0 to first device too:
Section "Device"
 Identifier "aticonfig-Device[0]-0"
 Driver "fglrx"
 BusID "PCI:1:0:0"
        Screen 0
EndSection

You are unable to reproduce because you are NOT using two screens. Your second screen is deleted (error line you provided). So I think you are using just two monitors as one screen.

Both bugs are still in saucy. I have 3 screens - two with white background. And compiz does not handle two or more screens anymore. Workaround is to start one instance per screen.