I edited a bunch of PAL VOB files out of a DVD with Premiere elements 11. I added menu items and then burned a DVD with NTSC preset. The burn completed successfully. When I play the DVD here in the US, the menu and any video and text I added new to the video is jittery. Once the portions of video that I used from the original PAL VOB files, the playback is fine. The clips I added in the middle are stuff that I either bought from shutterstock or menu items I added using premiere elements menu tools.
What could I be doing wrong? I want to be able to create output DVD in both NTSC and PAL and be able to play them here in the US and some of my family to be able to play them in PAL countries.