Disappearing System App icons in Dock

I can't get 'PREVIEW' and 'TEXT EDIT' apps to stay in my dock. I drag them in and they stay in place for about ten seconds before disappearing. They disappear even if the application is open. This only happens on my Mac Book. I am up to date with snow leopard and this doesn't happen on my iMac. I tried disk utility and permissions repair and have restarted several times but these little essential apps to me won't stay in line! I have removed some icons to be sure it wasn't a space issue.
Thanks for any help in advance.
christos

I am having the same problem as of today. This is happening to ONLY Aperture.... I have tried to restore my library using "commandoptionclick aperture", for the few seconds it is visible in my dock, but Aperture just opens right up.
Things I have tried:
Delete the two files:
com.apple.dock.db
com.apple.dock.plist
Open terminal and type (with caps and space):
Killall Dock
And
Moved: "MacintoshHD/System/Library/SyncServices/AutoRegistration/Clients/com.apple.doc k" to the trash and restarted before messing with anything. As soon as I restart and disconnect from the network I try to place Aperture back in the dock and it either disappears within seconds or disappears on close even after I select "Keep In Dock".
Someone help, I always am able to figure out this stuff on my own but NOTHING has worked and its only Aperture at this point which leads me to believe it is Aperture and nothing to do with my dock.

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