the problem is that putty has no any idea about your display, so X11 forwarding is more or less meaningless.
ssh -Y (from cygwin) created a virtual display on the remote host which was redirected to the local, real display.
You can try to login with ssh -Y and check how display is set and use that display from putty too (without disconnecting that ssh session).
Or you need to create something similar to ssh -Y, which is redirecting port 6010 (=virtual display :10) on the remote host to localhost:6000, but it may depend on how your local display (Xwin) was configured.
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