I'm using CentOS 6.4 64bit.
When I run wireshark i get the following error:
No protocol specified
(wireshark:3620): Gtk-WARNING **: cannot open display: :0.0
It has come to my attention that when I disable the network (clicking on the icon in the top right corner and clicking 'disconnect'),wireshark runs with no error. But then when I re-enable the network again, I get the same error.