On two of the Macs, as soon as I fired up the Citrix app, the Java vpn window would show 'error'. Then I remembered that I had done some Java development in the past and installed various jdks from Oracle so I ran: That was on the working Mac.
Then I remembered the difference between 'System' Java, Java plugins, and Java development kits.
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I sometimes find the Java setup on my various Apple devices to be a mystery.
To fix things for the moment I simply removed the jdk folders.
And then checked that the reported version of Java was 1.6 on each Mac.
Web applets still use the up to date, secure version 1.7 plugin.
Recently, I was trying to get a Java applet to run in the same way on 2 i Macs and my Mac Book Air.
The applet is a simple vpn client from Juniper that lets me access a Citrix Desktop from any Mac that I can install the Citrix receiver client on so I can work on 'Company stuff' from a large screen i Mac when I'm sat at home or from my Mac Book when I'm on the road (it works fine over 3/4G).