I have created a vs2008 Sequential Workflow with several Task Edit forms using InfoPath. When I give "Manage List" permission to the users that approves the task, everything works fine, but this is a security issue and obviously I don't want to give manage list access to the users, so I change the permission to Approve only. Workflow starts and sends an email to the responsible person and responsible person can open the edit task form in browser to approve or reject, but as soon as they click approve or reject, the SharePoint goes to another page showing "Operation in Progress" and stays there forever. I don’t think that this is a security issue within the Workflow code itself, since workflow run as system account. Most likely the InfoPath forms that have domain security have the problem. I don’t have any code on InfoPath form and as I mentioned, as soon as I change the workflow task list to have "Manage list" security, everything works fine again. Is there anybody else that had the same issue? If yes, how did you deal with the problem? Any suggestions?