As of 6/14/2011 Microsoft released a critical update (KB2530548) for Internet Explorer 9 that addresses the issue stated below, and manually adding a registry key may no longer be required.
Also, PaperVision Enterprise version R75 no longer requires this registry change.
When a user attempts to use PaperVision Enterprise ActiveX controls, such as the document viewer, workflow viewer, and administrative controls, Internet Explorer 9 appears to lock up and can only be closed via Task Manager.
In the Admin Console, an administrator selects a data group to be purged and enables the option “Submit Purge Job” to remove the data group from the system. The administrator then checks the deletion queue to see if the data group has been moved to the deletion queue and the data group is not listed.