fios live tv not working with Sierra 10.12.1
Verizon FIOS LIVE TV streaming over ethernet no longer works with Sierra 10.12.1 / Safari 10.0.1 on my iMac late 2009. The other streaming options like past TV episodes, movies, etc. all work. Fios Live TV works fine on my iPad and works on the same iMac under FireFox. When a channel like CNN is selected, the video window stays black with no loading activity, while the info bar at the bottom says the channel is playing. Verizon says there is a problem, but won't say who's problem it is. Any insights?
iMac, macOS Sierra (10.12.1), late 2009 iMac