Why can't I add, delete or replace icons in the dock?

Several icons in the dock have been replaced by question marks. I deleted the question marks, then replaced the application icons in the dock, and they worked. But when I restarted the machine, the question marks reappeared for those applications.
Even if I try to delete the question marks without replacing the application icons, the question marks reappear on restart.
Any new applications I try to add to the dock do not appear after a restart either.
Is the dock broken?

No just the .plist file for the Dock has been corrupted.
A bit of a overkill, but the free OnyX under the "Verify" has a Preferences checker, check the "show only corrupted .plist files" and run that.
Write down all the corrupted .plist files (you might have more) and seek and destroy them, they will be automatically be rebuilt.
Also it's good to run all the maintenance and cleaning aspects of Onyx once in a blue moon or if your experiencing usual behavior.
http://www.titanium.free.fr/

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