The specific switch is a Leviton DZ6HD which is a Z-Wave Plus device (at least, it says so on the box). So assuming that's correct, what events should I expect to see when the switch is turned on and off? I have very little experience with Z-Wave devices, the only one I have on my network today is a motion sensor, which works fine.
My UI and firmware match, both v5.3.0. I had cleared my Java cache after doing the firmware upgrade.