Apple conducts a iWork suite upgrade for OS X and iOS users. In this update previous errors are corrected and greater stability is added in each one of them, Apple says it clearly in the description of the update: 'This update includes stability improvements and bug fixes'.
In addition, the iMovie application for Mac is also updated to version 10.0.5, the improvements for this version of OS X speak of iCloud compatibility improvements with Movie Theater. Be that as it may, Apple had not updated these applications for a long time (since the past month of April) and now it does it to improve its performance and stability.
In the case of iMovie, if it is true that the Cupertino boys wear a faster update rate than with Pages, Keynote and Numbers, since they released the previous version of iMovie last July. Now Apple works on several fronts so that the applications are ready to receive the new version of OS X Yosemite in the case of Mac and iOS 8 in the rest of the company's iDevice. These new versions do not add interface changes or similar, they are basically focused on performance improvement thereof.
The new versions are already available for download and if they did not appear automatically on your Mac, you can always access them from the menu > Software Update or by accessing the Mac App Store in the updates section.