Client Windows 7 ultimate, NoMachine 5.1.62_1.
Server Ubuntu Linux 14.04 NoMachine 5.1.62_1, kubuntu desktop.
The Linux server is headless (no monitor, keyboard or mouse).
I can type password and see the desktop displayed with icons on the left. The desktop freezes before the GUI is fully displayed, e.g. the icons & buttons normally seen at the top-right of the screen are not displayed. I can move the mouse cursor around, but otherwise the Linux desktop is completely unresponsive.
If I attach monitor, keyboard and mouse then it works ok.
Thanks in advance for any help.