Screensaver image on screen when waking monitor

Hi I have a Quad Core Mac Pro running Snow Leopard 10.6.4. I've been having this issue for the past couple of weeks. Basically I have my monitor set to turn off after after 15 minutes of inactivity, my Mac Pro is always on.

After 5 minutes of inactivity my screensaver comes on and stays on until my monitor turns off. when I move my mouse to wake my monitor, sometimes an image from the screensaver appears onscreen for a few seconds and then disappears when my desktop appears.

I have repaired Permissions, rebuilt my drive using Disk Warrior, installed the 10.6.4 Combo update but the issue remains. An image from the screensaver doesn't always appear when I turn on my monitor, this issue is sort of random.

Usually my desktop appears right away with no static image from the screensaver. I don't know what else to do to fix this issue. Please help.

 

Anyone? Do you think that I should perform an Archive and Install?