You have Microsoft Office 2010 Beta installed on a computer that is running Windows 7 or Windows Server 2008 R2. When you use Office Help in the Offline mode, the Back button and the Forward button in Windows Internet Explorer 8 do not work correctly.
For example, you browse some Web pages in Internet Explorer 8, and then you click the Back button two times to return to a previous page. This behavior causes the Web page to stop responding. Additionally, the Back button and the Forward button do not work correctly on that page.
This issue occurs because a security update is implemented incorrectly in Internet Explorer 8. Each time that you click the Back button or the Forward button, the HTML parser in Internet Explorer 8 is required to restart parsing the Web page. When the Web page contains a META tag that specifies a content-encoding header, the restart process cannot find the navigation history of the Web page. This causes the button to stop working correctly.
Security update information
To resolve this problem, install the most recent cumulative security update for Windows Internet Explorer. To do this, visit the following Microsoft Web site: