Okay so I was working when suddenly when I click on "Open Actions" in the properties panel, the Actions window will not open. When clicking on with a fresh new object with no actions and doing the same, it just gives me the drop-down window for the actions and when I select one, nothing happens and the window still doesn't appear.
Same for triggers as well.
Working on Windows 8.1.
UPDATE: Rolling back to 2014.1 doesn't help at all