Workflow not working after installing Service Pack 1for SharePoint 2013
Issue: Workflow not working after installing Service Pack 1for SharePoint 2013
Solution: Please follow the below steps to resolve the issue.The workflow upgrade issue requires that STS and OServer patches are at the same version.
Here is the security update which you will need to install.
Update 2880963 for SharePoint Server 2013: May 13, 2014
Restart information: You do not have to restart the computer after you install this update
I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.