Dock/Cmd+Tab Icons shows up as blank

Recently all icons relating to webkit (chromium, safari, mailplane, fluid, even pages (not sure if it relates to webkit though..)) shows up as blank in the dock and cmd+tab boxes, however they show up just fine in the applications folder. very odd behaviour.
any ideas what might be causing this?
screenshot http://bit.ly/bcG9b0

Simply, removing the concerned applications and re-adding them to the dock, reseted the icons. Duuh.

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Vanishing Dock & CMD-TAB icons

Dear Administrator,
Recently, I upgraded my iMac Memory to 4GB and upgraded OS to OS X 10.6.8. After running the computer for long periods of time (4-5days), the newly opened program lost its icon in Dock and in CMD-TAB. It seems that the icons will reappear after I logout and then login in. I suspect that the reason for this is that I am running out of memory. But, before the upgrade, if the computer is running low on memory then it doesn't open any new applications. Now, the applications opens and works fine, except the icons were lost. Please help.
Sincerely yours,
Zigang Pan

Welcome to Apple Community forums.
Random is difficult to isolate. Try Safe Mode (It will take more time to startup in Safe Mode because it runs a directory check.)
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If your Finder functions correctly that way, go to System Preferences >> Accounts >> Login Items, and remove them. Boot normally and test. If not go to Users/(yourname)/Library/Contextual Menu Items and move whatever is there to the desktop. Then do the same with /Library/Contextual Menu Items. Lastly, try moving ~(yourname)/Library/Fonts to your desktop and restarting.
Log out/in or restart, if that sorts it start putting items back one at a time until you find the culprit.
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Hmm, my tabs screen looks the same as other recent versions. Could you double check both the non-private and private tabs (the two icons at the upper left of the tabs screen) in case your missing tabs are in the other category?

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Make sure the new tab feature is enabled:
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Code:
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[email protected]

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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
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Test while in safe mode. Same problem(s)?
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Hi, i am having a problem in my ipad 2 , it is not showing main screen just showing a black blank screen in which downloading icon is only shwn which is continously and when i connect to itunes via windows 7 it showing this error (0xE8000065) can any one

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When I open a new program in mountain lion it is not visible in the dock, nor can I select it with cmd-tab.

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Blurry icons in Cmd-TAB Application Switcher

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Dock/Cmd+Tab Icons shows up as blank

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