I would suggest closing the iCamSource application and then deleting your com.skjm.icamsource.plist file in your Library/Preferences folder in your home folder. Then, when you re-start the iCamSource, you will be starting with a fresh set of preferences, and hopefully things will act as expected.
If you are running Lion it hides the ~/Library directory for some reason. You can get to that directory by running Finder and then holding the Option key while clicking on the "Go" menu at the top of the screen. If you're holding down the Option key, "Library" will be one of the choices available. You should choose Library, then open the Preferences folder. The plist file will be in there.
