Maybe I'm being dense about this... I am using Fedora 14, with kdenlive-0.7.7.1.
Any time I try to use the "Crop" function, even 1 pixel, the whole video window blacks out. I tried rendering a short video to see if it were otherwise in the rendered version, but that is all black as well. Maybe I don't understand what it is supposed to do -- what I want is to "focus" the video on one small part of the image, blacking out the rest.
Any suggestions about what I can do/how to properly understand Crop?