Problem with migrating from classic windows to claims authentication

When I use the "Impersonation Step" in SharePoint Designer the workflow will use the credentials of the user who published the workflow instead of the user who started the workflow.

After I migrate to claims an error occurs and the workflow terminates. I have to re-publish the workflow to get it running again.

Error from SharePoint log:

12/09/2013 13:32:02.96               w3wp.exe (0x0DDC)                                    0x21EC SharePoint Foundation                        Workflow Infrastructure            88xr       Unexpected     WinWF Internal Error, terminating workflow Id# 2b7def0d-046f-4c85-bf5d-5b2f51134754            

12/09/2013 13:32:02.96               w3wp.exe (0x0DDC)                                    0x21EC SharePoint Foundation                        Workflow Infrastructure            98d4      Unexpected     System.NullReferenceException: Object reference not set to an instance of an object.    at Microsoft.SharePoint.Workflow.SPWinOEWSSService.GetWebForWorkflow(SPWorkflow wf, SPWorkflowUserContext runAsUser)    at Microsoft.SharePoint.Workflow.SPWinOEWSSService.get_Web()    at Microsoft.SharePoint.WorkflowActions.WorkflowContext.get_Web()    at Microsoft.SharePoint.WorkflowActions.Helper.GetFieldValue(WorkflowContext context, Guid listId, SPItemKey listItem, String fieldName, SPFieldType& type)    at Microsoft.SharePoint.WorkflowActions.Helper.TestListItem(WorkflowContext context, Guid listId, SPItemKey listItem, String fieldName, String comparison, Object value)    at Microsoft.SharePoint.WorkflowActions.Helper.TestListItem(WorkflowContext context, String listIdOrName, SPItemKey listIt...          

12/09/2013 13:32:02.96*             w3wp.exe (0x0DDC)                                    0x21EC SharePoint Foundation                        Workflow Infrastructure            98d4      Unexpected     ...em, String fieldName, String comparison, Object value)    at Microsoft.SharePoint.WorkflowActions.WithKey.WaitForActivity.ConditionNotTrue(Object sender, ConditionalEventArgs e)    at System.Workflow.Activities.CodeCondition.Evaluate(Activity ownerActivity, IServiceProvider provider)    at System.Workflow.Activities.WhileActivity.TryNextIteration(ActivityExecutionContext context)    at System.Workflow.Activities.WhileActivity.System.Workflow.ComponentModel.IActivityEventListener<System.Workflow.ComponentModel.ActivityExecutionStatusChangedEventArgs>.OnEvent(Object sender, ActivityExecutionStatusChangedEventArgs e)    at System.Workflow.ComponentModel.ActivityExecutorDelegateInfo`1.ActivityExecutorDelegateOperation.Run(IWorkflowCoreRuntime workflowCoreRuntime)    at System.Workflow.Ru...    

12/09/2013 13:32:02.96*             w3wp.exe (0x0DDC)                                    0x21EC SharePoint Foundation                        Workflow Infrastructure            98d4      Unexpected     ...ntime.Scheduler.Run()    

Thanks, Ron