I just installedWBS Modeler add-in for Visio 2010 (I have Visio Premium 2010 installed). The add-in works great for exporting a Visio WBS to .mpp, but when I import an .mpp file to a blank WBS Modeler document, I get a blank Element Explore Window, see attached screendump and no tasks, even though I have created several levels of tasks in my test .mpp file.
NB: I have Project Professional 2010 installed.