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Hi,

Looks like you have permission problems, you need to check the permissions assigned to the Folders you are unable to save files to:

- In Finder select the Folder, use Cmd+I shortcut to open info window, scroll down and look to the permission section:

There should be your user name with Read & Write privilege. If there is no your user name, add it with "+" button below the list and set Privilege to "Read & Write".

Maxim