The clipboard code has been released in the new 'curr' version of XFree86-xserv-4.3.0-40.
To make a long story short: this new version should crash less. :)
To use the new clipboard code, do the following:
1) Edit your startup script (startxwin.bat, startxdmcp.bat, or startxwin.sh).
2) Remove any launching of 'xhost', unless you specifically know that you need it.
3) Remove any launching of 'xwinclip'; xwinclip provides similar functionality to the '-clipboard' integrated clipboard client.
4) Add the '-clipboard' command-line parameter to the line that launches XWin.exe. For example, change 'XWin -multiwindow' to 'XWin -multiwindow -clipboard'.
5) The integrated clipboard client will work with local applications, ssh tunneled applications, and Xdmcp sessions without any special configuration or startup-file hacks.
Harold