Paul A. Rubin wrote:
No, I believe it is tex2lyx. SWP uses the natheight and natwidth options for \includegraphics, and tex2lyx seems to choke on them. Following a hint in the graphicx documentation, if you change natheight=6in, natwidth=8in to bb=0 0 6 8 (in the SWP .tex file), tex2lyx writes a .lyx file that LyX can actually digest.
This is now bug 4418. It turns out that if tex2lyx has to process natheight/natwidth, it converts them to a bounding box but omits the space between the height and width (turning four bounding box arguments into three, the last of which is indigestible).
/Paul
