I've finally found that the seg fault in lxdialog is in
code attempting to retrieve some locale info.
I suspect the same problem may be causing
my problem with KDE.
As root I ran dpkg-reconfigure locales
and chose en_US ISO-8859-1 from the list
no errors reported
then I ran locale-gen with no errors reported
After logging out and back in again, I see
LANG=en_US in my environment variables but
I still have the problem with lxdialog and KDE
Is there something else I need to do to get my locale
set up properly?