20 minutes into the tutorial I managed to break primal vision. I was exploring the world with primal vision on, paused the game because I realized maybe that's a good idea. Ended up losing primal vision (I do not have the exact specifics here), and now I am unable to turn it back on. I can't easily find green animals now, and there does not appear to be a way to fix this. The main menu item is grayed out, and the tab key does not appear to do anything.