Description of problem: vncts gives a blank screen with a X mouse pointer while connected. How reproducible: Enabled vncts in xinetd.d, restart computer, then connect to yourdomain:1 or 2,3,4,5 etc.... You'll see a blank screen with the X mouse pointer
That's usually indicative that your DISPLAYMANAGER (as defined in /etc/sysconfig/desktop) doesn't have XDMCP enabled (at least for access from localhost).
Can you confirm that your DISPLAYMANAGER (gdm/kdm/whatever) has XDMCP enabled?
ping... 1+ months waiting for feedback from reporter.
Closing, lack of feedback.