Comment 2 for bug 28010

Couldn't tell you because the only other Ubuntu installation I have is the 5.10 LiveCD which has a defective ssh client.

I can run other X11 applications without incident.

From the MacOS side we are now up to MacOS 10.4.5 the error is different and immediate. No window comes up, and the new error is:
The program 'gvim' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAtom (invalid Atom parameter)'.
  (Details: serial 184 error_code 5 request_code 20 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.)