Mouse cursor disappears when entering Remoter window

[rsteinberger]

I am using Remoter on an iMac, OS X 10.11.4. I have two remote devices, both Raspberry Pi running Raspian Jessie, both running tightvncserver. The older setup (Pi 2) runs fine. I see the mouse when I enter the Remoter window. In the newer setup (a Pi 3), the mouse disappears when I enter the Remoter window. I can't see it or interact with the screen. I believe I have started the tightvncserver the same way on both Pi boxes. How do I track down what's wrong? What should I try?