Clean install of OSX Mavericks and its time for first network utility.  Moving from old version of OSX I discovered Mavericks requires a separate installation of X11.
Software:
- 
http://xquartz.macosforge.org and download XQuartz a X11 server.
- 
http://www.wireshark.org and download Wireshark network protocol analyser.
Installation:
- Install both XQuartz and Wireshark in that order.
- Launch Wireshark
- Window will popup asking for X11 installation.
- Select XQuartz
Issue:
- XQuartz and Wireshark OSX app launched, however wireshark X11 window will NOT pop up. 
Fix:
- Close down wireshark and XQuartz (in that order)
- Start up XQuartz.
- Start up some inbuilt X11 Applications. e.g.: Terminal, Xman, Xlogo.
- Start up Wiresharek again.
After about 5 min wireshark X11 window will POP up. 
- After the initial problem wireshark now works every time.