I've got a Region 2 (not multi) DVD player and a (legally purchased) Region 1 NTSC Disc.

Used k9copy to see if copy would work on player. Didn't need to select anything as entire disc fitted on just over 4GB.

Copy plays back perfectly on computer. 

Copy now starts playback on DVD, but keeps stopping - freezing perfectly - for a second or two - and loses sound from time to time.

This forum seemed a safer place to ask this question than did the project site. May I ask if anyone has any suggestions for solving this one?