Seems to me that using Xming.exe +extension Composite -query ... solves the issue (is a workaround for the Gnome bogosity). More accurately, I use "C:\Program Files\Xming\Xming.exe" +extension Composite -clipboard -once -query HOST to good effect.
Cheers, Paul Paul Szabo p...@maths.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia