midori Xlib error on launch

[frozencemetery (Robbie Harwood)]

When I try to launch midori through an ssh-forwarded session, it starts to draw the window (grey rectangle) and then dies with the following:

robbie@osxserver:~$ midori
Xlib:  extension "RANDR" missing on display "localhost:10.0".

(midori4:76291): Gtk-WARNING **: Error loading theme icon 'tab-new' for stock: Icon 'tab-new' not present in theme

(midori4:76291): Gtk-WARNING **: Error loading theme icon 'bookmark-new' for stock: Icon 'bookmark-new' not present in theme

(midori4:76291): Gtk-WARNING **: Error loading theme icon 'user-trash' for stock: Icon 'user-trash' not present in theme
The program 'midori4' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadLength (poly request too large or internal Xlib length erro'.
  (Details: serial 185 error_code 16 request_code 72 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
robbie@osxserver:~$ echo $?
1
robbie@osxserver:~$ 

Inspecting the options available through --help, I see --debug, but this causes:

robbie@osxserver:~$ midori -g
Xlib:  extension "RANDR" missing on display "localhost:10.0".
Launching command: '/usr/bin/gdb' --batch -ex 'set print thread-events off' -ex run -ex 'set logging on /var/tmp/midori-robbie/gdb.bt' -ex 'bt' --return-child-result --args midori 
/usr/libexec/gdb/gdb-i386-apple-darwin: unrecognized option `--return-child-result'
Use `/usr/libexec/gdb/gdb-i386-apple-darwin --help' for a complete list of options.
robbie@osxserver:~$ echo $?
0
robbie@osxserver:~$ 

and so I am unable to provide more information.

System is 10.6.8. Thanks!