I recently brought back some DVD's recorded at a conference in Florida, USA. They play on my UK DVD and computer but with with horizontal lines across the picture. Is this a region problem or a NTSC to Pal issue.
If it was region locked, you would not be able to play the DVD at all (or gotten a warning that your DVD drive's region can only be changed 5 times). Therefore it is likely a video issue. If you're still using an old 4:3 TV or monitor it could be widescreen letterboxing but more likely it is the NTSC/PAL issue.