xword won't open puzzles

Since upgrading to oneiric, xword won't open puzzles. I usually download puzzles from http://www.macnamarasband.com/dlpuz.html. They always worked fine under natty, but I get the following when trying to open one in oneiric:

Traceback (most recent call last):
  File "/usr/games/xword", line 1202, in <lambda>
    self.handler = win.connect('destroy', lambda w: self.exit())
  File "/usr/games/xword", line 1344, in exit
    self.write_puzzle()
  File "/usr/games/xword", line 1338, in write_puzzle
    fname = self.get_puzzle_file(self.puzzle)
  File "/usr/games/xword", line 1294, in get_puzzle_file
    return dir + '/' + puzzle.hashcode()
  File "/usr/games/xword", line 314, in hashcode
    m = md5.new()
AttributeError: 'builtin_function_or_method' object has no attribute 'new'

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xword 1.0-7ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: wl
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Sat Oct 15 22:11:57 2011
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: xword
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (1 days ago)