yo frankie only shows some clouds, game doesn't start

On startup, yo frankie only shows some clouds accompagnied by a repeating musical motif. The only key that has
some effect is Ecsc, which closes the game.

This is the error output:
$ yofrankie-bge
read library: '/usr/share/yofrankie-bge/chars/butterfly.blend', '//../chars/butterfly.blend'
read library: '/usr/share/yofrankie-bge/chars/frankie.blend', '//../chars/frankie.blend'
read library: '/usr/share/yofrankie-bge/chars/frankie_actions.blend', '//../chars/frankie_actions.blend'
read library: '/usr/share/yofrankie-bge/chars/bird.blend', '//../chars/bird.blend'
read library: '/usr/share/yofrankie-bge/chars/momo_actions.blend', '//momo_actions.blend'
read library: '/usr/share/yofrankie-bge/chars/frankie_actions.blend', '//frankie_actions.blend'
Detected GL_ARB_texture_env_combine
Detected GL_ARB_texture_cube_map
Detected GL_ARB_multitexture
Detected GL_ARB_shader_objects
Detected GL_ARB_vertex_shader
Detected GL_ARB_fragment_shader
Detected GL_ARB_vertex_program
Detected GL_ARB_depth_texture
Detected GL_EXT_separate_specular_color
warning: could not open '/usr/share/yofrankie-bge/levels/start_menu.bgeconf'
Warning, sensor "menu_delay" has lost a link to a controller (link 2 of 3) from object "menu_logic"
 possible causes are partially appended objects or an error reading the file,logic may be incorrect
Warning, sensor "menu_delay" could not find its controller (link 3 of 3) from object "menu_logic"
 there has been an error converting the blender controller for the game engine,logic may be incorrect
Warning, sensor "sensor2" has lost a link to a controller (link 1 of 1) from object "butterfly_logic"
 possible causes are partially appended objects or an error reading the file,logic may be incorrect
Python module can't be imported - object 'menu_logic', controller 'init_options#CONTR#1':
Traceback (most recent call last):
  File "/usr/share/yofrankie-bge/levels/menu_scripts/__init__.py", line 20, in <module>
    import init
ImportError: No module named init
Warning: could not open marshal file
Python module can't be imported - object 'menu_logic', controller 'menu_logic#CONTR#3':
Traceback (most recent call last):
  File "/usr/share/yofrankie-bge/levels/menu_scripts/__init__.py", line 20, in <module>
    import init
ImportError: No module named init
Python module can't be imported - object 'joy_message', controller 'menu_joystick_message#CONTR#2':
Traceback (most recent call last):
  File "/usr/share/yofrankie-bge/levels/menu_scripts/__init__.py", line 20, in <module>
    import init
ImportError: No module named init

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: yofrankie 1.1b~svn106-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sun Dec 4 16:37:24 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
SourcePackage: yofrankie
UpgradeStatus: No upgrade log present (probably fresh install)