There are only two possibilities I can think of. 1) The pointers to the video file(s) are hard coded in the .d2v project file. Open the .d2v file in a text editor, note the paths to the video files (.vob, etc), and make sure the files are still in the proper place. If not, either edit the .d2v file to correct it, or re-save the project in DVD2AVI again. 2) Make sure you use DVD2AVI 1.76, which is the version included with Gknot. This is less likely than the first problem, but it's the only other thing I can think of.