Aperture 3.4.5 and other earlier versions are using Google Maps in the Places view. Apple did not renew the contract with Google and the Maps are no longer working in Aperture. User cotton-x posted a clever fix to patch the iPhoto application, so that it is using a private key to access Google's servers. The same fix is working well for Aperture 3.4.5 and probably the earlier versions of Aperture as well. See this link if you want to try it.
I tested this in Aperture 3.4.5 and could display the terrain maps again, that have far more detail than the new maps in the current version 3.6 of Aperture.

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