bleachbit ran with hundreds of ridiculous errors -- "failure to open .. *[ msg | docbook ]' and so on -- when invoked by User in KDE GUI (Mageia 3, 64-bit CPUs). Using command-line (as shown at Sourceforge) as Root, the issue become clearer as it failed with a clear exception message (as beow):

# bleachbit --preview
Gtk-Message: Failed to load module "canberra-gtk-module"
info: starting BleachBit version 0.9.5
Traceback (most recent call last):
  File "/usr/bin/bleachbit", line 52, in <module>
    bleachbit.CLI.process_cmd_line()
  File "/usr/share/bleachbit/CLI.py", line 198, in process_cmd_line
    preview_or_clean(operations, False)
  File "/usr/share/bleachbit/CLI.py", line 104, in preview_or_clean
    worker = Worker.Worker(cb, really_clean, operations).run()
  File "/usr/share/bleachbit/Worker.py", line 62, in __init__
    raise RuntimeError("No work to do")
RuntimeError: No work to do
#

Installing 
"lib64canberra-gtk0 - GTK modules for the libcanberra XDG complient sound event library" 
appears to resolve the bug as both command-line and GUI work as expected afterwards

# bleachbit --preview
info: starting BleachBit version 0.9.5
Traceback (most recent call last):
  File "/usr/bin/bleachbit", line 52, in <module>
    bleachbit.CLI.process_cmd_line()
  File "/usr/share/bleachbit/CLI.py", line 198, in process_cmd_line
    preview_or_clean(operations, False)
  File "/usr/share/bleachbit/CLI.py", line 104, in preview_or_clean
    worker = Worker.Worker(cb, really_clean, operations).run()
  File "/usr/share/bleachbit/Worker.py", line 62, in __init__
    raise RuntimeError("No work to do")
RuntimeError: No work to do
#

Library Dependencies NEED TO BE CORRECTED or appended (for the Mageia supported version).