I got have two Lifecam VX-2000's and they don't work in cheese anymore. I don't know if it's a problem with a missing package, or a package I installed. Here is the output.

(cheese:11122): Clutter-WARNING **: No listener with the specified listener id 29

(cheese:11122): Clutter-WARNING **: No listener with the specified listener id 30

(cheese:11122): Clutter-WARNING **: No listener with the specified listener id 31

(cheese:11122): Clutter-WARNING **: No listener with the specified listener id 32

(cheese:11122): GLib-CRITICAL **: g_hash_table_remove_internal: assertion `hash_table != NULL' failed

(cheese:11122): Clutter-WARNING **: Not able to remove listener with id 1

(cheese:11122): GLib-CRITICAL **: g_hash_table_size: assertion `hash_table != NULL'      failed
totem-video-thumbnailer: 'file:///home/myusername/Videos/Webcam/2012-09-20-     191530.webm' isn't thumbnailable
Reason: Media contains no supported video streams.

** (cheese:11122): WARNING **: could not generate thumbnail for       /home/myusername/Videos/Webcam/2012-09-20-191530.webm (video/webm)

Notice the: Reason: Media contains no supported video streams.

When I try to record a video it just makes a 13.2KB WEBM file with nothing. When I take a picture it works. Edit: I've been thinking that the problem started after installing the MediUbuntu repository on my system.