After applying Security Update for Microsoft InfoPath 2010 (KB2687422) and Security Update for Microsoft InfoPath 2010 (KB2760406) K2-integrated InfoPath forms no longer open in the InfoPath 2010 client. These Microsoft updates were released on 9 April 2013.
The following Microsoft updates are applied to a client machine:
A user attempts to open a worklist item with an InfoPath task form.
The following error is displayed:
InfoPath cannot open the following file: http://sharepointURL/_layouts/K2/RuntimeServices/OpenInfoPathTask.aspx. The file is not a valid XML file.
Details: The form contains XML that cannot be parsed: Reference to undefined entity 'nbsp'.
1. Open the form in the web browser.
2. Uninstall the Microsoft updates for the tasks to open in the InfoPath client.Resolution
A coldfix for this issue is available from K2 Technical Support on supported versions of K2 blackpearl. Please contact K2 Technical Support to request this fix.