After allowing Mozilla Firefox web browser to automatically install the latest security updates (v3.6.14), I/A Series (Niagara) R2 or G3 graphic screens cannot be displayed.
Mozilla Firefox 3.6.14
Graphic pages served by a UNC/ENC or Enterprise Server/ENS with any version of I/A Series R2 or G3 (Niagara) software
Known and documented issue with the way Mozilla Firefox 3.6.14 handles the loading of Java applets.
The issue has already been documented on the Mozilla Firefox support forum.
Downgrade to an older version of Mozilla Firefox or use a different compatible web browser.
Older Firefox releases are on the Mozilla FTP site (Mozilla FTP).