I have had my wife's iMac (C2D, 10.5.2) set for screen saver and active corners (upper left activate) ever since it was new with no issues. However, of late the active corner does not start her screensaver. I tried changing the active corner to be something else (like blank display) and it works fine, so it is not the active corner setup that is failing. Also when I go into System Preferences/Screensaver and click TEST it starts the screensaver no problem, or if I leave it until the screensaver timeout it starts as normal. Has anybody seen anything like this before?