vncconfig fails to start

[Eddie Atherton]

After wondering why I wasn't able to cut/paste from Winblows to my Linux 
VNC session, I found it was because I wasn't running vncconfig.  So. I 
added it to my xstartup.  However, this didn't work.  This is what I 
added to xstartup:

vncconfig -display=:1 -nowin &

And this is the result, from the VNC log:

vncconfig: xcb_lock.c:62: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - 
(dpy->request)) >= 0)' failed.

The other thing I also noticed, was this, at the end of the VNC log, 
when KDE shuts down:

startkde: Running shutdown scripts...
startkde: Done.
/home/eddie/.vnc/xstartup: line 9: 16052 Aborted                 
vncconfig -display=:1 -nowin

Any ideas, anyone.

Cheers,
Eddie