I'm quite disapointed with MoviePlus, I'm not exactly sure if there is a certain reason or if it is the overall functionality of the program.
One reason I dislike it is because I find navigating through your Library difficult and slow to load picture thumbnails. There is also no search function present here, meaning that it is hard to find the pictures you want when you have a large number of images. It would be handy to be able to drag and drop pictures from another folder on your computer either directly to your project or to your Library.
I'm not saying it is bad software... but there is room for improvement.
Right now I am using the Free Windows Movie Maker instead of MoviePlus.
Perhaps there should be a thread that users can suggest possible improvements as (although I am clueless) I think that MoviePlus is the least popular in the 'X' range of Serif Software but could be up there with the rest of them.