Some Notes 8.5.x clients seem to randomly and intermittently crash after the Web browser is upgraded to Internet Explorer 9 (IE9) on Windows 7 workstations.
This issue has been found to occur for users running Notes 8.5.x clients on Windows 7 workstations with the default browser set to Internet Explorer 9 and the Notes Preference for Web Browser set to "Use the browser that I have set as default for the operating system" . Analysis shows that the crash is caused by the OS .dll named "d2d1.dll".
Resolving the problem
Refer to the following Microsoft Knowledge Base articles for information on how to download and install a patch for this issue.