Status menu bar with too many icons
The Iguana controller displays as a icon in the menu bar - here’s a screen shot fragment showing what it’s meant to look like, see the IG logo with the screen dot?:
However if your Mac has a lot of software with status bar icons it’s possible for the Iguana controller to be hidden by the menu of your current application coming from the left. In the following screen shot fragment, IguanaX is running but not visible:
This is something to look for if you cannot see the Iguana status bar icon after starting it.