Can't use mintty instead of rxvt for remote ssh -Y and xserver?

[Reckoner]

Hi,

I'm starting my xserver using

   C:\cygwin\bin\run.exe -p /usr/X11R6/bin XWin -multiwindow
-clipboard -silent-dup-error

and then I do:

   C:\cygwin\bin\rxvt.exe -e /bin/xhere /bin/zsh

when I do

   % ssh -Y host@remote.edu

I can successfully open remote x-windows.

However,

If I use mintty 0.91 instead of rxvt as shown below:

   C:\cygwin\bin\mintty.exe -e /bin/xhere /bin/zsh

when I do

   % ssh -Y host@remote.edu

I *cannot* successfully open remote x-windows.

Note that changing the shell from zsh to bash doesn't help at all.

Any advice appreciated.

The appropriate log files are attached.
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