I'm using the latest of both IntelliJ and the Ruby plugin (2.5.13234) on Mac OS X and am really surprised that no code navigation or code completions work at all. About once a week, under some conditions I haven't determined yet, I notice by accident that code navigation (by holding the command key and hovering over a symbol) will start to work only to find that the next time I try it, it's broken again.
I have a feeling that there is something borked in my installation since I don't see any other people mention this issue. Any help would be greatly appreciated. IntelliJ is seriously neutered without this stuff working.