In the web app on my.pogoplug when I select "Security Settings" I get the following error message;

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This page at https://my.pogoplug.com says

Cannot access parent frame state!

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Security settings are not accessed and when I click the message dialog OK it falls back to the last settings page accessed. Then, if I select Security Settings again immediately no error message appears and the Security Settings page opens correctly.

I think this started to appear after the UI and Service versions were updated.

Has anyone else experienced this error? Does anyone know how to eliminate it?

Your suggestions appreciated! Thanks

(P.S. my firmware is version 2.1.2 and UI and Service versions are both 2.5.2, my browser is Firefox 3.0.17 running on Linux Mint 7 OS)