How are you entering the serial number? From an administrator account or a regular user account?
Aperture is installed for all users on your mac, so the serial number is written to the system library, not the user library, and this requires read/write access for administrators. Do you enter your serial number using an administrator account?
Also, you may have a corrupted "ProAppSystemID" file or Aperture cannot write to the System Library.
To stop Aperture asking for the serial number, first check, if you still have an old file "ProAppSystemID" in your System Library.
- Quit Aperture.
- Go to your MacintoshHD and open the folder "Library", then "Application Support", then "ProApps".
- Remove the File "ProAppsSystemID" to the Desktop, if it exist and restart Aperture.
- Reenter your serial number, hopefully for the last time.
Sometimes Aperture writes this file to a temporary directory, when it cannot write to the Library. If the above does not work, look at the temporary directory /tmp
Use the Finder's "Go" menu
Go > Got to folder and enter /tmp into the textfield. If you see the file there, move it to its proper location.
In this case you may want to repair the permissions on your system drive; you can do this using the "First Aid" tools in "Disk Utility" (located in Applications > Utilities)
Also, make sure you are on Aperture 3.4.3 as it is supposed to resolve this issue.
About Aperture 3.4.3
Addresses an issue that could cause a licensed copy of Aperture to prompt for a serial number with each launch
I hate to sound naive, but I am fairly sure I am entering the serial number as regualar user.
Somehow I think this problem has fixed itself. ..sorta.
Prior. I was opening Aperture without the library connected on the external drive. Now with the library connect, Aperture seems to recognize itself. .... maybe. I have only had it forget the serial number once.. even with the library connect.
Confusing I know.
I did as you instructed and looked for "ProAppSystemID". It wasn''t there.
Though I will keep your words close if this continues to be a problem.
I am running 3.4.3
Did you do all your updates?
Sounds like you may have to update to the latest version of RAW support, version 4.02. You can check which version you are running by opening Aperture, clicking on the Aperture menu and choosing About Aperture. You should see the RAW version number in the window that opens.
If you are up to date, try reprocessing the images that are coming up as unsupported Photos > Reprocess Original...