Aperture received an update Tuesday designed to address several issues regarding iPhoto compatibility and other bug fixes.
Many of the fixes focus on interaction with iPhoto. For example, the update fixes instances where Aperture crashes while importing large iPhoto libraries, and now imports albums from iPhoto 9 correctly. Also, importing slideshows with text slides and RAW images has also been improved. An issue that caused Aperture to stop responding when trying to process damaged images has also been resolved.
A full list of fixes can be found on Aperture's support page. Aperture 3.1.2 is a 297.63 MB download and is now available via Software Update,