If you are running Sparkbooth on a Mac, do not update your Adobe AIR runtime to 2.5.1 which was released this week. Adobe AIR 2.5.1 for Mac seems to have broken the camera access.
If you do have 2.5.1 installed, you can go back to 2.5.0:
- Go to Applications/Utilities and run the Adobe AIR Uninstaller
- Go to http://kb2.adobe.com/cps/853/cpsid_85304.html
- Download the Adobe AIR 2.5.0 and install it
- Do not update to Adobe AIR 2.5.1 when prompted