Hello Herold, I have no idea how to solve the problem with the xwinclip, but I use xwinclip with XDMCP since it is available. I´m running on different machines, and a delay of 10 seconds is too short for some machines! I´m using a sleep 15 directly after starting XWin in XDMCP. The slowest machine a TP770X (P3-300) had no more problems after setting the delay to 15 seconds, maybe some slower machines could need a longer delay. A mechanism would be helpfull, there the xwinclip retries to connect to the XServer every x seconds in overall time of lets say 30 seconds. But, that seems to be the problem with the libX11. :-(
regards, Darko