I thought that was the case... It looks like the last update on this one was in March and we have had 2 releases since then, so chances are the widget isn't compatible anymore.
I don't know of any Print widgets available right now, but this might be a good sample for us to look at doing. We are encouraging all users to migrate to using the new JavaScript extensions for Ops Dashboard instead of WPF. These new extensions have the ability to run in desktop and web dashboards, so you only have to write the code once to use both ways.