Update:
Based on conversations in other thread, it looks like it’s not that smart lighting is broken, but rather that it is now requiring that the “number of buttons” field be set. if it isn’t set, it assumes there is only one button on the device.
So if you are using a stock device type handler, like the one for the minimote, report the problem to support.
If you are using a custom device type handler, like the one for the hue dimmer, report it to the author of that device type handler and they can probably add the number of buttons line and fix the problem right away.