Description of problem:
Trying to take a picture with cheese, the countdown works, but when it ends, nothing happens, and the buttons are not sensitive (disabled).

Version-Release number of selected component (if applicable):
cheese-3.3.90-2.fc17.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Start cheese
2.Try to take a photo
3.
  
Actual results:
No picture is taken, UI buttons stay not sensitive (disabled).

Expected results:
Picture is taken after the countdown, UI buttons enabled again and ready to take more pictures.

Additional info:

Gtk-DEBUG: Connecting to session manager

Gtk-WARNING **: Attempting to add a widget with type GtkImage to a GtkToggleButton, but as a GtkBin subclass a GtkToggleButton can only contain one widget at a time; it already contains a widget of type GtkLabel

Gtk-WARNING **: Attempting to add a widget with type GtkImage to a GtkToggleButton, but as a GtkBin subclass a GtkToggleButton can only contain one widget at a time; it already contains a widget of type GtkLabel

Gtk-WARNING **: Attempting to add a widget with type GtkImage to a GtkToggleButton, but as a GtkBin subclass a GtkToggleButton can only contain one widget at a time; it already contains a widget of type GtkLabel

Gtk-WARNING **: Attempting to add a widget with type GtkImage to a GtkButton, but as a GtkBin subclass a GtkButton can only contain one widget at a time; it already contains a widget of type GtkLabel

Gtk-WARNING **: Attempting to add a widget with type GtkGrid to a GtkToggleButton, but as a GtkBin subclass a GtkToggleButton can only contain one widget at a time; it already contains a widget of type GtkLabel

Gtk-WARNING **: Attempting to add a widget with type GtkImage to a GtkButton, but as a GtkBin subclass a GtkButton can only contain one widget at a time; it already contains a widget of type GtkLabel

** CRITICAL **: cheese_main_window_finish_countdown_callback: assertion `self != NULL' failed

Gtk-CRITICAL **: gtk_main_quit: assertion `main_loops != NULL' failed


The problem is probably due to the assertion failure in cheese_main_window_finish_countdown_callback

Marking as final blocker as per criteria:
All applications listed under the Applications menu or category must withstand a basic functionality test and not crash after a few minutes of normal use. They must also have working Help and Help -> About menu items 

A webcam application should be able to take pictures, this is basic functionality.