Firefox 5.0; JonDoFox 2.5.1 Ubuntu 11.04.

"An unknown IP address, possibly your own, was uncovered by Flash."

"Proxy: Jon Do" shows in bottom rhs of screen when trying to do this test.

In what way could I "not be using JonDonym correctly"?

You could

1) use JonDoFox https://anonymous-proxy-servers.net/en/jondofox.html with installed and configured NoScript Add-on to block Flash

or

2) install NoScript for Firefox http://noscript.net/ to block Flash

or

3) disable Flash and other plugins in Firefox

or

4) use a proxifier to use Flash over JonDo correctly https://anonymous-proxy-servers.net/en/ ... ml#widecap