Hello, I have noticed there is a bug in the KB2880998 (http://support.microsoft.com/kb/2880998) which was deployed by Microsoft on 12th August  2014. This causes a serious Workflow Manager 1.0 related problem in  SharePoint 2013 server. After you install this package you face an issue: Method 'StartWorkflowOnListItem' in type 'Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider' from assembly 'Microsoft.SharePoint.WorkflowServices, ...