After applying the August 2010 Cumulative Update for SharePoint 2010, I started to see the following error in Application Event Logs around every 30 seconds. They occurred on the server that was running the FIM Services:
EVENT ID 3
Provider: ForeFront Identity Manager
Microsoft.ResourceManagement.Service: Microsoft.ResourceManagement.Workflow.Hosting.WorkflowManagerException: Forefront Identity Management Service does not support workflows of type 'Microsoft.ResourceManagement.Workflow.Activities.SequentialWorkflow, Microsoft.ResourceManagement, Version=4.0.2450.9, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. at Microsoft.ResourceManagement.Workflow.Hosting.HostActivator.ActivateHost(ResourceManagementWorkflowDefinition workflowDefinition) at Microsoft.ResourceManagement.Workflow.Hosting.WorkflowManager.StartWorkflowInstance(Guid workflowInstanceIdentifier, KeyValuePair`2 additionalParameters
After a call to Microsoft I was told that they are "aware of the issue" and a hotfix and associated KB article will be released very soon. The product group stated that these "errors are benign".
Verdict: Harmless but annoying