As I can see on the official website, the application is compatible with Mac OS X 10.5 and higher up to 10.9. It should work normally, from this point of view. However, I would like to recommend re-installing the software using the new installation that can be downloaded from the website. It's possible that the videos you're using are not compatible with the HandyShare application even if you use the ones recorded with a compatible camera. Additionally, install the previous version if this is not working right.