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First, quit the software. If you are running a Zaxwerks plug-in inside of Adobe After Effects, quit After Effects. If you are running ProAnimator as a standalone, quit ProAnimator.
Then make sure you set your "Ownership & Permissions" setting to "Read & Write". To do this, go to the folder that contains the Zaxwerks software, then use the "File > Get Info" command.
Next check your "Root Hard Drive > Library > Preferences" and make sure the "Read & Write" permissions are allowed here as well. Afterwards, go to your "User > Library > Preferences" file, and be sure you have "Read & Write" permissions.
Restart your computer.
If you were having trouble with the ProAnimator standalone, launch ProAnimator and enter your authorization code.
If you were having trouble with a plug-in, launch Adobe After Effects. Apply the plug-in and enter the authorization code.
If you set the "Read & Write" permissions correctly, you should haven't any further issues after the code has been accepted.