dpi still driving me nuts

2 questions relating to dpi.

My first problem is that every few minutes _something_ is changing my
144 dpi back to 96 dpi and I can't work out what it is. I'm not
running any gnome or kde applications (eg gnome-settings-daemon) just
fluxbox, fbpager, emacs, mrxvt, firefox, gkrellm, bluetooth-applet and
NetworkManager. I start fluxbox with XDM and it starts up the X server
with '-dpi 144'. I've been eliminating the running apps one by one but
I can't seem to find the culprit. Any ideas?

2/ It seems that fluxbox understands font sizes as _pixels_ not points
which is darned useless. A sans-8 font on a 96 dpi display is fine,
but on a 144 dpi display it's tiny. Is there any way to specify font
sizes in points? I don't want to have to customizes style for every
different display I use!!! A second best would be for style files to
have conditionals in them: eg. (borrowing from bash syntax, but
anything else would do as well):

if [ $DPI -gt 100 ]; then
window.font:  sans-10
else
window.font:  sans-8
fi

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