I can confirm the bug is related to cheese, because even if my webcam didn't work with other application (such as skype), giving the following commands:
$modprobe -r uvcvideo
$modprobe uvcvideo
the webcam come back to work in Skype. In addition, if I try to run Cheese again, the webcam stops working in every application, so it's necessary to do again the previous commands.
I can confirm the bug is related to cheese, because even if my webcam didn't work with other application (such as skype), giving the following commands:
$modprobe -r uvcvideo
$modprobe uvcvideo
the webcam come back to work in Skype. In addition, if I try to run Cheese again, the webcam stops working in every application, so it's necessary to do again the previous commands.
I hope it could be useful for the developers.