Hi Ed,

As has been mentioned, this problem does crop up from time to time.
It is addressed here:

http://www.projectpluto.com/faq_curr.htm#missing_asteroids

_Usually_, the fix described therein fixes the problem: it boils
down to asteroid elements not being available to the program, and once
you make them available (from the second Guide CD-ROM), asteroids reappear.

However, some folks have been reporting that this doesn't do the
job. I still have no idea why. I expect I'll be adding some "test"
code to investigate the problem: something that will build up a report
file logging what Guide is doing when drawing asteroids, that will
allow me to see where the problem comes into play.

-- Bill