Mouse Locator wont work

ok, so my own fault i turned it off. when i went back to turn it on the mouse locator in the preferences pane was missing.

i’ve managed to extract and ftp into the preferences pane the mouse locator file, it now shows up in preferences but when i click on “activate mouse loactor” it stays ticked for approx 3-5 secs, then the screen flashes (bit like the iphone screen does when you take a snapshot of the screen) then it gets unticked.

can anyone help? this thin is driving me crazy! :evil: