In LyX 1.4.4svn, Fedora Core 4, I find that when I view dvi files using the "Show changes in output" facility, the dvipost utility is not automatically run so the changes are not coloured. I have created a "Change DVI" type that has "dvipost $$i $$o" as its converter.
However, surely LyX should be running dvipost automatically? -- John C. McCabe-Dansted PhD Student University of Western Australia