I can see the controls in the Transform panel enable and disable as I change tool. Clearly, the panel only works when the Move Tool is selected.
The rotate and skew functions are working today, so I guess whatever stopped them working yesterday has gone away. The areas where those functions active are quite small and hard to find though.
It wouldn't hurt for the move tool to display a little padlock if you try to use it on a locked layer. The icon in the layers panel is easy to miss, and since locking a layer doesn't stop you editing it in some ways, it is easy to forget that a layer is locked. Also, if you open a JPEG, you start off with a locked layer that is selected, so that's a way to be working on a locked layer without having actively selected it.
Why are people so set against this application being made easier and more intuitive?