Displaying answerbook requires support for the DPS extension in the X server. The DPS extension is supported by most common Unix workstations, but not by most PC/X offerings and is often an extra cost item for X terminals.
A number of people have reported success using ghostview as a replacement for the answerbook viewer, but this has the unfortunate side effect of not supporting the hypertext links in the documents.
A better solution is to install a client side Display PostScript extension.
Adobe has defined such a client side extension and call it DPS-NX. Bluestone sells a version.
Solaris 2.6 and later come with an answerbook HTTP server which can be used with any web browser.