I discovered that, after installing the August 2014 PU, that when users clicked on the Workflows link, on a list item popup, that an error was displayed rather than the Workflows page. This was the error:
Method 'StartWorkFlowOnListUItem' in type 'Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider' from assembly 'Microsoft.SharePoint.WorkflowServices, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' does not have an implementation.
I don't know if this error manifested itself prior to this update, since I didn't check for it. In any case, I then researched this error and found a TechNet posting that addressed exactly this issue: SharePoint Server SP1 installation- Error related to workflow. According to this posting, the error is resolved by installing UpdateKB2880963. So, I installed it on my development farm, which mirrors production. Prior to installing the update, the Workflow Solutions Framework component build number was 15.0.4571.1502.
After installing KB2880963 on the WFE (there's only one, presently), clicking on the Workflows link returned this error:
File Not Found.
and the Workflow Solutions Framework component build number was 15.0.4615.1001. I performed an IISreset, but this didn't resolve the error. I ran the Products Configuration Wizard, but this also didn't resolve the problem.
I would be grateful if someone could present a solution or workaround: presently, my users do not have access to list Workflows pages.
These are the ULS entries for the error:
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Application error when access /_layouts/15/Workflow.aspx, Error=Could not load file or assembly 'Microsoft.Workflow.Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateByMonitoringParameter(Guid monitoringParameter, Int32 offset, Int32 count, Boolean checkPermissions, Nullable`1 secondaryMonitoringParameter) at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateInstancesForListItem(Guid listId, Int32 itemId, Int32 offset) at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateInstancesForListItem(Guid listId, Int32 itemId) at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPageBase.ConstructStatusArraysWF4(ArrayList running, ArrayList completed, Boolean onlyMyWorkflows) at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPage.ConstructStatusArrays() at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPage.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
and
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System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Workflow.Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateByMonitoringParameter(Guid monitoringParameter, Int32 offset, Int32 count, Boolean checkPermissions, Nullable`1 secondaryMonitoringParameter) at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateInstancesForListItem(Guid listId, Int32 itemId, Int32 offset) at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateInstancesForListItem(Guid listId, Int32 itemId) at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPageBase.ConstructStatusArraysWF4(ArrayList running, ArrayList completed, Boolean onlyMyWorkflows) at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPage.ConstructStatusArrays() at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPage.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
and---------
Getting Error Message for Exception System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Workflow.Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. File name: 'Microsoft.Workflow.Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateByMonitoringParameter(Guid monitoringParameter, Int32 offset, Int32 count, Boolean checkPermissions, Nullable`1 secondaryMonitoringParameter) at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateInstancesForListItem(Guid listId, Int32 itemId, Int32 offset) at Microsoft.SharePoint.WorkflowServices.FabricWorkflowInstanceProvider.EnumerateInstancesForListItem(Guid listId, Int32 itemId) at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPageBase.ConstructStatusArraysWF4(ArrayList running, ArrayList completed, Boolean onlyMyWorkflows) at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPage.ConstructStatusArrays() at Microsoft.SharePoint.WorkflowServices.ApplicationPages.WorkflowPage.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)