One thing you can try is closing the iCamSource Pro application and then deleting your com.skjm.icamsourcepro.plist file in your Library/Preferences folder in your home folder. However, as mentioned, we are continuing to test iCamSource Pro and iCamSource on OSX Yosemite and will have a version available to address any issues introduced by the new operating system for its final release.
To delete the com.skjm.icamsourcepro.plist you can access the ~/Library 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.