This is what I have
That's allSection "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
DefaultDepth 24
EndSection
Section "Module"
Load "glx"
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "fglrx"
EndSection
Section "ServerFlags"
Option "DontZap" "False"
EndSection
Are the artifacts the dotted lines below trash and home
Any other?
If not I'd say it's something with that plasmoid