I tried creating chapter points in SpruceUp and had it automatically generate thumbnails from the chapter points. From the simulation within SpruceUp, the menu was working fine. I finally burnt it to a DVD-RW and popped it into a set-top box and the movie played fine. Accessed the menu and all it brought up was a blank white screen. The buttons were still there since I could press the cursor keys and see the highlighted button change, but the thumbnails were gone.

Any ideas what's gone wrong?