Hi, I experience the same problem on my Mac running LyX 1.5.1. When I look at "Tools/TeX Information/LaTeX styles" I see both, "xcolor.sty" and "soul.sty". I tested "xcolor" form the terminal and it worked. "Soul" contains as far as I can tell only the .sty file, so copying it to a location included in the path should do (and it is even recognized by LyX).
Doesn't solve the problem however ... Kurt > I'd like to see the change tracking in the pdflatex output. However, I > only get the error that I've to install xcolor and soul or define > \lyxdeleted and \lyxadded. As I'm not a latex professional I couldn't > really figure out how to do that. > > Any Ideas? (You have been great so far :-)!!!!!) > > btw: I'm running lyx 1.5.0 on Ubuntu 7.04 > > Cheers > Michael