I have 2 computers: echo.local is running Ubuntu 9.04. justin.local is running Mac OS 10.6.1. X11 version on the mac is 2.3.4.
I open X11 on the mac, and open a new xterm window (Applications Menu -> Terminal), everything is fine. Keyboard works as expected.
ssh -X echo.local from the mac (connecting to the linux box), and from the linux command prompt, start xterm - everything is fine. Keyboard works as expected.
gnome-session from the linux command prompt (through SSH), gnome launches, but keyboard mapping is ALL types of screwed up. If I kill gnome-session and open an xterm via ssh, keyboard mapping is still screwed up. If I then kill the SSH session entirely, and do X11 -> Applications Menu -> Terminal, opening a brand new xterm window on the mac with no SSH session running at all ... keyboard mapping is still screwed up.
Only after I quit X11 and relaunch, is the keyboard mapping back to normal.
Keyboard layout under GNOME is Apple->MacBook/MacBook Pro.