I managed to find Rube and was not able to interact with him. I read on global chat some people had this problem because someone else was already talking to him but there was no-one else around in my case.
I was unable to interact with Rube the first time I encountered him, but he told me that he was working with someone else... even though no one else appeared to be anywhere nearby.
when rube showed up and i couldnt talk to him, if i just waited he would just say something like "hey yeoz want to trade" and after that I was able to speak to him.
This is the third test in a row where Rube has shown up where nobody else is around and then refused to load ( talk to me) Not quite true, last encounter he stole my orb, but that's another story.
Used to be that if he was there for someone else he'd say so.
Rube's getting on my nerves.