Question mark instead of application logo?

For some strange reason once in a while (not often) my Mac deside to replaces an application logo that is in my dock with a question mark. Nothing was done to the application itself so I'm wondering why it just changes the image.
I went back into the application folder again and was able to put the image back in the same spot.
Does anyone have an idea why this may be?
Dorian

If the problem keeps recurring, then the preference file for the Dock is corrupt. To fix it, go the the Preferences folder of your account and delete the following file:
com.apple.dock.plist
The Dock will be reset to its default settings and icons. You'll then have to put things back the way you want it.

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