LispWorks may print a message saying that it is unable to open a font and is using a default instead. The environment will still run but it may not always use the right font.
LispWorks comes configured with the fonts most commonly found with the target machine type. However the fonts supplied vary between implementations and installations. The fonts available on a particular server can be determined by using the
command. Fonts are chosen based on the X11 resources. See X11/Motif resources for more information.
It may be necessary to change the fonts used by LispWorks.
LispWorks Release Notes and Installation Guide - 23 Dec 2011