File Permissions Are Ignored

Hi Maccies,
There are several user accounts on my Mac.
I have a file in /Users/Shared/ where all (user, group, and others) can read & write; and File -> Get Info also says "you can read and write".
In actuality, only when I am logged in as the file owner can I edit the file; when I am logged in with any other account, I get the error message:
You do not have sufficient privileges to perform this operation (MacOS Error code: -5000)
Again, File -> Get Info says: "you can read and write".
Could it have anything to do with FileVault? I doubt it, because this problem seems to be relatively recent, and I've been using FileVault for a while.
I have Repaired Permissions; yet, the problem persist.
What's the deal here?

The Shared folder has a special permission setting which bars accounts from renaming or deleting files directly inside which they don't own. Some applications rename the original file as part of the saving process.
Create a subfolder and move the file to it from the owner's account.
(62436)

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So I cannot even access the application. It was working fine yesterday and today I get this error message:
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I have changed nothing. All the pictures are there on the computer. Help?!

Reboot. Close any programs which open at start-up. Run Disk Utility (you can type this in the Spotlight search field at the right end of your Menubar).
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I have inadvertently changed a file permission setting. When opening Aperture I get the following; "Aperture cannot access this library. To use this library make sure it's file permissions are set correctly". I am an old dude new to Mac OS. Looked in settings but have no idea how to allow file sharing to myself. I have been using Aperture actively for 6 weeks. I'm the only one using this Mac. What up?

Back up all data now.
This procedure will unlock all your user files (not system files) and reset their ownership and access-control lists to the default. If you've set special values for those attributes on any of your files, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. If none of this is meaningful to you, you don't need to worry about it.
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If you have more than one user account, and the one in question is not an administrator account, then temporarily promote it to administrator status in the Users & Groups preference pane. You can demote it back to standard status when this step has been completed.
Launch the Terminal application in any of the following ways:
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Aperture cannot access this library" followed by "To use this library, make sure its file permissions are set correctly."

Hi,
I am completely confused. I use aperture everyday and today when I tried to open it I got the following message " aperture cannot access this library" then it said to use this library , make sure its file permissions are set correctly"
So i read a bunch of posts and opened aperture while holding down option and command and repaired the file permissions. it did nothing, when I tried to open aperture I received the same message. So then i tried opening it while holding down just the option key. This brought up all of my libraries but when I chose the library i use daily the same message came up.
Does anyone know how to fix this and/ or why it is happening?
Thank you

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I think I set it to keep the images in the library not referenced but the drive did contain many pictures before I started using Aperture so i need to bring them into the library.
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I repaired the permissions in aperture first aid. I notice my short user name has changed from the one before the mavericks upgrade.

I notice my short user name has changed from the one before the mavericks upgrade.
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Last edited by sand_man (2010-01-21 11:28:13)

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HI and Welcome to Apple Discussions..
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