ISight not working from one user account on MacBook

Hi everyone,
It'd be great to get some help with fixing an iSight camera. I've followed the instructions here:
http://support.apple.com/kb/HT2090
and have narrowed it down to a particular user account (it has admin permissions). Other user accounts can access the iSight fine. However, every application I try under that one user account can't access the iSight.
Unfortunatly it's my wife's account. She quite likes to skype her family in the earthquake prone area of New Zealand called Christchurch.
Any ideas of things I could try, permissions I could reset, etc would be great.
I've tried:
* resetting the PRAM
* resetting the SMC
* rebooting
* fixing disk permissions (from multiple accounts)
I've got a reasonably techy background, so even telling me the device node that the iSight is accessable on would be useful - that way I can manually check the permissions on that.
Thanks!
Tim

Hi Tim,
That was partly my fault (well actually it was entirely my fault)
I missed this bit:-
However, every application I try under that one user account can't access the iSight.
Now it is really Odd that this one user cannot access the camera at all in any App where as other users on the Mac can.
I would start with the FONT BOOK.
Check that all Fonts are active, particularly the System Fonts.
Certain Apple Apps will not work properly if Helvetica or Lucida Grande are turned Off or Missing.
Basically we are looking for something that she has changed (or has become corrupt) that is not directly linked to the camera but is needed (there is no direct way to turn On or Off the camera access). (Fonts are first choice)
Next check the Address Book.
Is the My Card (Head and Shoulders icon) actually listing her details.
Have a look at this
This Apple Article refers to a .plist that is a System wide one.
However as a .plist it may be the thing that is blocking access to one user.
I don't have it on my G4/1GHz Dual processor running 10.5.8 but neither do I have iMovie 7 (from iLife '08)
Some people have reported that removing this gets the camera back for iChat.
Make the Address Book Export of copy of itself (File Menu > Export > Archive)
After that I would try moving (NOT Deleting) the whole contents of her Home Folder/Library/Preferences.
Then Restart the computer then try specific apps.
If Skype then works you will know it is one of the .plists that you moved.
Then comes the monotonous bit of moving back some .plists at a time until you can narrow down the one that is at fault.
Have you tried a Safe Boot ? (it will need another restart after it has done that)
9:00 PM Wednesday; July 20, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb( 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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