I have a Nuvi 370 with the same software versions as you. I tested the Cyclops USA/canada file (Oct 8, 2015) with the same speed camera as you. However, when I pass the camera on highway 20 in Levis like you, I only get an icon. I don't get a sound warming and the bar at the top of the screen does not turn red (stays green).
If I test camera in the UK, it works perfectly.
Any ideas?