dvd flick to shrink - can't play dvd

I've re-authored many dvds with dvd shrink connecting to nero 7 and they've all played in my entertainment center dvd player (samsung dvd-5500).

This weekend I tried dvd flick for the first time and then re-authored the converted files in dvd shrink. the resulting dvds played in my computer dvd drive through PowerDVD, but not in my stand alone dvd player (the samsung). I got this error message upon inserting the dvd:

This disc cannot be played.
Please check the TV system.

Any suggestions?

thanks,
core