Did you connect your webcam to you computer first? Maybe thats why it does not detect your webcam.
Ok, this time I uninstalled Timershot/and deleted all the files associated with it (anything with the name "timershot")/disconnected camera/rebooted/(just) opened Timershot, which installed it/rebooted/connected camera/ran Timershot...

...This time the devices drop window actually came down (unlike before), but still no devices recognized.

Then I tried disconnecting camera/running the program first/then re-connected the camera...still the same.