Picture is black and white

Hi Everyone

I just converted an avi to dvd with convertxto dvd. Now the picture is black and white (in fact a little bit brownish).
Can anyone help me how to find out what the problem is?
Other forums said me that it’s because you try to play PAL to NTSC (or the other way around I don’t know).
But in fact: both the avi and the dvd are in NTSC? I checked it with ConvertXto DVD itself.

Thanks

Stefan