Windows 7 (64-bit) - VNCViewer listen crash on connection

[NoFastidies]

Running
"C:\Program Files\UltraVNC\vncviewer.exe" -dsmplugin msrc4plugin.dsm -listen 5500
or
"C:\Program Files (x86)\UltraVNC\vncviewer.exe" -dsmplugin msrc4plugin.dsm -listen 5500

as Administrator on my Windows 7 64-bit system crashes if a connection comes in.
What am I doing wrong?

[redge]

known issue already fixed
need to use msrc4plugin.dsm version 1.2.4.0
otherwise
you can try open source SecureVNCPlugin.dsm
http://adamwalling.com/SecureVNC/