MySonic 5.2 Wierdness - goes too fast

I have a slide show (created with Windows Movie Maker) then imported to MySonic 5.2. Previewing the menu layout and chapters in Mysonic looks like the soon-to-be DVD is flawless, but after burning the DVD the video timescale seems to be sped up, while the audio is realtime. In other words, the music plays normally, but the slides go by too fast, the transitions happen too quickly, and so I run through a chapter’s worth of slides before the music finishes.

Anyone else seen this or have a solution? MySonic is impossible to reach (and for this reason alone I would strongly discourage anyone from buying anything made by them).