With a UIButton, if you press down, move away from the button, and come back to it (all without lifting your finger), the button highlights again as though it is pressed. However, if you release on top of the button, it does not register as a click. It's also drawing with the Pressed color rather than e.g. the Hover color even though it's effectively not being pressed.
This is a really minor edge-case issue (you kind of have to go out of your way to do it), but I figured I'd mention it as it seems unintentional.
