Fix for Mac dock mirror in leopard

Open a terminal window and type:

defaults write com.apple.dock no-glass -boolean YES

Then type this to restart the dock:

killall Dock

to revert type:

defaults write com.apple.dock no-glass -boolean NO

Then killall Dock again:

killall Dock

Funny insert: I kept messing it up (typing in the dark in bed) by typing “killall Dick” - Ouch!