Comment 4 for bug 870847

Here's stdout and stderr from running software-center in a terminal, annotated with # to show what I'm doing at each point:

2012-04-28 15:19:00,325 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2012-04-28 15:19:00,330 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
2012-04-28 15:19:19,787 - softwarecenter.db.database - INFO - reopen() database
2012-04-28 15:19:19,787 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
2012-04-28 15:19:27,410 - softwarecenter.ui.gtk3.gmenusearch - WARNING - could not load GMenu path: Failed to look up menu_file for "settings.menu"

# I click the Edit Review dialog
(software-center:11803): Gtk-WARNING **: Unable to show 'none': Operation not supported
# Edit Review dialog is visible
# Attempting to submit modification. Error is displayed: "Unknown error communicating with server. Check your log and consider raising a bug report if this error persists")
# Closed Edit Review dialog
2012-04-28 15:19:36,251 - softwarecenter.ui.gtk3.app - INFO - software-center-agent finished with status 0
2012-04-28 15:19:36,252 - softwarecenter.db.database - INFO - reopen() database
2012-04-28 15:19:36,252 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
2012-04-28 15:19:36,375 - softwarecenter.ui.gtk3.gmenusearch - WARNING - could not load GMenu path: Failed to look up menu_file for "settings.menu"

2012-04-28 15:20:57,928 - softwarecenter.backend.spawn_helper - WARNING - exit code 1 from helper for '['/usr/share/software-center/modify_review_gtk3.py', '--parent-xid', '', '--iconname', 'psensor', '--datadir', '/usr/share/software-center/', '--review-id', '43043']'
2012-04-28 15:20:57,928 - softwarecenter.backend.spawn_helper - WARNING - got error from helper: '
(modify_review_gtk3.py:11843): Gtk-WARNING **: Unknown property: GtkGrid.n-rows

(modify_review_gtk3.py:11843): Gdk-CRITICAL **: gdk_window_invalidate_rect_full: assertion `GDK_IS_WINDOW (window)' failed

(modify_review_gtk3.py:11843): Gdk-CRITICAL **: gdk_window_invalidate_rect_full: assertion `GDK_IS_WINDOW (window)' failed
modify_review
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/review_gui_helper.py", line 242, in _submit_modify_if_pending
    rating=rating)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/validators.py", line 65, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/validators.py", line 65, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/validators.py", line 44, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/validators.py", line 40, in wrapper
    pattern))
ValidationException: Argument 'review_text' must match pattern '[^\n]+$'
Argument 'review_text' must match pattern '[^\n]+$'
'