Issue that this hotfix package fixes
Assume that you install Service Pack 1 for SharePoint Server 2010, and that you have a running out-of-box (OOB) workflow instance that was started before the installation of Service Pack 1. For example, there is a running "Approval – SharePoint 2010," "Collect Feedback – SharePoint 2010," or "Publishing Approval" workflow instance. Then, a task assignee edits the workflow task (for example, by approving or rejecting the task). In this situation, the task is locked and cannot be recovered.
Notes- Workflow instances that are started after the installation of SharePoint Server 2010 Service Pack 1 are not affected by this issue.
- You must install this hotfix immediately after you install SharePoint Server 2010 Service Pack 1.
To resolve this issue, you must apply the hotfix package in this article together with the following hotfix package:
2687557 Description of the SharePoint Foundation 2010 hotfix package (Wss-x-none.msp): October 30, 2012