Problems with Dock in Mac OS 10.5 Leopard on iMac.

I have a friend with a strange problem in the Dock. Sometimes by just launching any kind of application, the Dock becomes completely transparent and the icons in the Dock disappear when the mouse pointer is moved above. The only way to get back the good Dock is to restart the computer or close the user session.
The computer is the last iMac aluminium 20-inch, 2GHz Core2Duo, ATI Radeon HD 2400 XT, Mac OS 10.5.4.
You can see here:
http://img296.imageshack.us/img296/1429/image2nb4.jpg
The computer is totally clean. No software or hack for Dock modifications has been installed!!
Personally, I have a Power Mac G5 and a MacBook pro Santa Rosa running Leopard, and I have never got this problem with the Dock. Then, it seems that this Dock problem is specific to iMac computer.
I would want to have feelings from other iMac users.
Thanks!
Message was edited by: Riad SEDDIK

If it happens in a new user you may be able to repair this with the 10.5.4 Combo Update This is a fuller install, as opposed to an incremental "delta" update so it should overwrite any files that are damaged or missing. It does not matter if you have applied it before.
Remember to Verify Disk before update and repair permissions after update from /Applications/Utilities/Disk Utility.
-mj

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