I'm getting Error in strwidth(...) : X11 font at size 15 could not be loaded kinds of errors when I try to change cex to something *other* than 1 (works OK otherwise). I can't get through to RSiteSearch() right now, but as I recall my search of it only revealed people who had problems because they had failed to install fonts: my Knoppix/tracking Debian unstable distribution claims that the most recent versions of xfonts-100dpi and xfonts-75dpi are both installed. (version 1:1.0.0-2) I'm using the Xorg version of X11. xset -q says: /usr/X11R6/lib/X11/fonts/misc:unscaled,/usr/X11R6/lib/X11/fonts/misc,/usr/X11R6/lib/X11/fonts/75dpi:unscaled, /usr/X11R6/lib/X11/fonts/75dpi,/usr/X11R6/lib/X11/fonts/100dpi:unscaled,/usr/X11R6/lib/X11/fonts/100dpi, /usr/X11R6/lib/X11/fonts/Speedo,/usr/X11R6/lib/X11/fonts/Type1,/usr/share/fonts/ttf/western, /usr/share/fonts/ttf/decoratives,/usr/share/fonts/truetype/ttf-bitstream-vera,/usr/share/fonts/latex-ttf-fonts, /usr/share/fonts/X11/misc/,/usr/share/fonts/X11/Type1/,/usr/share/fonts/X11/100dpi/,/usr/share/fonts/X11/75dpi I haven't noticed any other applications on my system having problems finding fonts, not that that's a very strong test. Any ideas about where to start looking/diagnosing? thanks Ben Bolker