entire system freezes after turning the microsoft HD webcam on through stopmotion

[Ricardo Gentil de Araújo Pereira]

Runing programs:
Amarok
amule
Transmission
Pidgin
Chromium

After I started stopmotion and clicked the botton for turning on the webcam (Microsoft HD) there were intence HD activity and the system got gradually slow until I was unable to open anything. Tried to go terminal but got login time end messages (typed root and enter but can't get to password type dialog in less than 60 seconds).
Ended doing a hard reset after a couple of minutes (maybe 3 of 5).

Don't know if this is stopmotion specific since I saw this kind of behaviour before.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: stopmotion 0.6.2-1.1ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-11.49-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Sep 13 11:35:25 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: stopmotion
UpgradeStatus: No upgrade log present (probably fresh install)