I uploaded version 1.3.1 to the first post. The new version adds the current stats using the bookstate API when closing the archive. That allows the front page to be updated properly even when pbimageviewer.app is started from the Applications tab. Thanks to @m4mmon for providing the patch for that.
@m4mmon also provided instructions and patches for building pbimageviewer.app using the official SDK_6.3.0 sdk. You can get that stuff at
http://komary.net/pbimageviewer/libs/ if you want to build the application yourself. The instructions may also be useful to those who want to build other software packages against the latest SDK.