

I have also tried other albums with the same result.

More information about the update are available here, full changelog below.

Apple released a minor update to Aperture a few minutes ago, improving compatibility with the importing process of iPhoto libraries and a number of reliability improvements for brushes. The new version comes with fixes for toolbars not hiding correctly in fullscreen mode, as well as better formatting for the book, card and calendar themes. The issue, reported by several users on Apple Support Communities, caused an iPhoto events to be split into multiple instances on an iPhone, iPod touch or iPad after an iTunes sync. Also, note that this only works for Mountain Lion and Mavericks. Reading DOC will set you in the right direction, however. If you do not have that either, there are other ways to get it, but this would be out of scope for this article. If you have a Time Machine backup with iPhoto 9. OSX Lion, for instance, is restricted to version 9.
