calc.el stops working

[phr-2002]

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In GNU Emacs 21.2.1 (i386-redhat-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-04-08 on porky.devel.redhat.com
configured using `configure  i386-redhat-linux --prefix=/usr --exec-prefix=/usr 
--bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share 
--includedir=/usr/include --libdir=/usr/lib --libexecdir=/usr/libexec 
--localstatedir=/var --sharedstatedir=/usr/com --mandir=/usr/share/man 
--infodir=/usr/share/info --with-gcc --with-pop --with-sound'
Important settings:
  value of $LC_ALL: nil
  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: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: nil

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

On upgrading to Emacs 21.2.1 (I think as part of an upgrade to Red Hat
7.3 GNU/Linux from 7.2--it's not my system so I'm not sure how this
upgrade happened), I find my copy of calc.el that I installed earlier
has stopped working.  Pressing any digit key (like "3") produces the
error message "[bad format]".  Anyone encountered this already?
It's possible that it's some kind of local problem, or something
already known that there's a fix for.  I haven't tried reinstalling
calc.el or checking whether there's a new version.