Go to an empty spot in the taskbar and right click and push properties then go to bottom of box and uncheck 'Hide inactive Icons'. Hope this helps.
even when the screen saver is "none" and my computer is on and i dont use it for aprox. 30 min. i still can t open tray.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic