Hi Bob,

"...This [crash when adding comets] has happened before with
Guide, although I thought this problem was corrected."

I thought so, too. Could you please e-mail me the corrupted
'comets.dat' file? (I note that you mention that you "edited out
the offending lines", so I may be asking a little too late! But
I thought I'd give it a try. Ideally, we'd have a copy of your
'comets.dat' from just _before_ the crash, but that would be
hoping for too much...)

-- Bill