Thumbnails don't show in Finder or Stacks

I use a MacBook Pro running OS X Leopard 10.5.6, VMware Fusion 2.0.2, Skitch and Pixelmator.
As you can see, sometimes, OS X doesn't show thumbnails of pictures in Finder or Stacks.
Everytime this happens, *I have to re-boot my Mac.*
I have no idea why this happens and workaround but all I can do is just re-boot.
Anybody having the same or a similar issue?
Time Machine has nothing to do with this because I don't use it.
However, I have a doubt on VMware Fusion, I've got no proof though.

I am also experiencing the same issue where thumbnails will not load in icon view. This system is less than 2 wks old with little in the way of changes from the factory default settings. When working from the local HDD the system will get into a mode where it will either stop displaying thumbnails of png or jpg files or it will take minutes to load the thumbnails (when there are <30 files in the folder). If the system is rebooted the thumbnails will load correctly again. The need to reboot several times a day though for proper icon view thumbnails is a real irritation. After convincing my wife to convert to a Mac for superior reliability this is a real disappointment.
Any suggestions to resolve this would be greatly appreciated.

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