this has been happening for a little while, but i kept forgetting to make a note about it since it wasn't exactly something bothersome and i haven't updated my browser yet so i'm currently playing on old flash version (and can't send bug reports in-game), so i hafta apologize on both those accounts and for any inconvenience this causes.
basically, i had rube come visit me on my [housing] block recently and i don't know what happened, but after that weird instance, any time i come on my block (teleport, refresh, etc) and go to the area where i had that trade at, i can see rube's leaving animation (and if i click on his spot, the notice that he's "done trading for the time being") and that's it. i can't recall if i've had any trades specifically on my block since it's been occurring, but i have been getting them still, in general.