I found this on their website:
How do I playback DVD files from my hard disk and what are the limitations?
Please note the following points :
(1) You can only open “VIDEO_TS.IFO” (For DVD Video Format) or “VR_MANGR.IFO” (For DVD Video Recording Format) to play the file set.
(2) DVD Auto-Resume function will be unavailable.
(3) Bookmarks may be set during initial playback but will not be available for recall when playing the file set again.
Maybe time to try different software ?