chameleon for grasshopper

Hi!

I am having trouble installing Chameleon . For some reason the tab doesn't show up, although I am following all of the installation instructions in the pdf they give you. I have tried restarting everything, still no change .
The tab does show up in Revit though, so I'm assuming there must be a Grashopper setting that I am missing. 

Does anyone have any idea what it might cause this?