I'm using the SwitchCompat library in my app but it seems to be missing the thumb image on certain devices. (4.2.2, 4.1, 4.3 are the devices i tested on.) Instead it just displays the track with nothing indicating whether the switch is on or off.
This is a bug. I have confirmed it on my Nexus 7. and as znggo has pointed out, He did file a bug report here.