I opened bug 299966 for KDE/Qt but I realized that it is an x11vnc problem. The problem is that I cannot left-click with "virtual" VNC mouse in the Qt table headers to sort-by-column the table. Physical mouse always works fine. VNC mouse right-click always works fine. VNC mouse left-click works fine in other places. The problem is only left-clicking in the Qt column header with VNC mouse (it does nothing).
what is your Qt version?
The stable one: 4.6.3
Still valid with 0.9.13-r1?
Haven't tested with 0.9.13-r1 (still not stable), but it is working fine even with 0.9.13