Apple released over the week-end several updates:
Aperture 1.5.6
The Aperture 1.5.6 Update addresses issues related to performance, improves overall stability, and supports compatibility with Mac OS X 10.5 Leopard. Other specific issues addressed in this release include:
Resolves some minor compatibility issues with iPhoto 7.1, which organizes images by Event rather than Roll.
Addresses issues related to metadata and sort order when sharing previews with iLife Media Browser.
Improves reliability of queries based on Import Session.
Addresses reliability when recovering an Aperture Library from a Vault.
This update is recommended for all Aperture users.
http://docs.info.apple.com/article.html?artnum=306387
Apple Remote Desktop version 3.2
Apple Remote Desktop (ARD) version 3.2 can be installed on computers that have:
