Steps: 1. Log into a graphical MATE session. 2. On another machine, open an SSH session to that host with X11 forwarding. (I've tried macOS with XQuartz and PuTTY with Cygwin X.) 3. In the SSH session, run 'caja'. Expected: Caja window opens on forwarded X server. Actual: Caja opens on the host machine, in the graphical MATE session.