CEC is working fine here with 2 different setups and TV´s.
Most common issue (I would actually say 9/10 times we get a report) is that the communication between the two fails after an update or new install.
Always reset everything and try again: Unplug (power) your TV and Pi for a couple of minutes and let them reset properly, then boot up your TV before booting Pi.
Make sure CEC is enabled (on some TV´s you need to choose the device) and try again.