On OS X with 2.0 Beta 3:
Several of us are using RubyMine in the office. They can press COMMAND and then mouse-over methods and objects. The moused-over object or method is highlighted and clicking on it allows them to jump to the method declaration.
I have somehow disabled this behavior but I don't know how. I can right-click on the the method name, choose Go To and Declaration and it takes me to the correct place. But no combination of modifiers gets the mouse-over behavior they are seeing. What have I done and how do I undo it?