16:9 to 4:3

Hello…
I created a slideshow to export to DVD. I chose the iDVD option and it rendered 16:9 as planned. I recently purchased Toast 11 Pro (w/HD plug-in) and that option created a movie with the 16:9 squished to 4:3…not sure why. Does anyone know how to prevent that from happening. I’ve double-checked the settings for both FM and Toast.