Using a legacy ~/.lyx can cause LyX to crash upon generating a PDF (pdflatex) file. If a dvi file has been exported previously LyX will not update the .tex file, and will continue to use the old .tex for generating the .pdf file until another dvi file is generated.
Bug exists in lyx1.4.4svn and 1.5.0svn To reproduce: 1) set ~/.lyxrc/preferences to be the single line: \format "pdflatex" "pdflatex" "pdflatex" "" "" "" "" 2) Start LyX 3) Start a new file 4) View (or export) PDF (pdflatex) LyX will then crash. Workaround: remove \format "pdflatex" "pdflatex" "pdflatex" "" "" "" "" line from ~/.lyx/preferences -- John C. McCabe-Dansted PhD Student University of Western Australia