Cursor disappears on C-d

[William Brower]

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In GNU Emacs 21.1.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-10-31 on monkeyboy.kmr.ll.mit.edu
Important settings:
  value of $LC_ALL: C
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Hello. This is an interesting bug.  Amazing as it sounds,
if you put your cursor here ------^ on the above line
and hit C-d, the cursor disappears.  Strangely, it only
seems to occur if a sentence starts with 'A' and there are
two spaces between the '.' and the 'A'.  You can test this
by hitting C-d with the cursor here ---^ and see that the
cursor does not disappear. I'm in "Fundamental" mode when
I do this (although while submitting this bug, I see it
occurs in "Mail" mode, too).

Bill Brower
wbrower@ll.mit.edu