Apple just released an update for Aperture 3, version 3.0.1. Here’s the support article on it; go grab it and report back if it fixes any of your issues!

What’s included? Here’s the list…

About Aperture 3.0.1

This update improves overall stability and addresses a number of issues in Aperture 3, including:

• Upgrading libraries from earlier versions of Aperture
• Importing libraries from iPhoto
• Importing photos directly from a camera
• Memory usage when processing heavily-retouched photos
• Face recognition processing
• Adding undetected faces using the Add Missing Face button
• Printing pages containing multiple images
• Printing photos and contact sheets with borders and metadata
• Editing photos using an external editor
• Display of images with Definition and Straighten adjustments applied
• Zooming photos in the Viewer and in the Loupe using keyboard shortcuts
• Accessing Aperture libraries on a network volume Selecting and moving pins on the Places map
• Adding and editing custom locations using the Manage My Places window
• Switching between masters when working with RAW+JPEG pairs.

 This update is recommended for all users of Aperture 3.