I have the same issue as described in these posts.
Perhaps this Event Log related to an exception will help.
Regards,
Event Log: Application
Type Date Time Event Source Category Domain\User Computer
Information 5/31/2010 3:02:12 PM 0 WDFME None N/A SYS1-
System.Reflection.TargetInvocationException: Exception has been thrown by the
target of an invocation. —> System.Runtime.Remoting.RemotingException: Failed
to connect to an IPC Port: The system cannot find the file specified. Server
stack trace: at System.Runtime.Remoting.Channels.Ipc.IpcPort.Connect(String
portName, Boolean secure, TokenImpersonationLevel impersonationLevel, Int32
timeout) at
System.Runtime.Remoting.Channels.Ipc.ConnectionCache.GetConnection(String
portName, Boolean secure, TokenImpersonationLevel level, Int32 timeout) at
System.Runtime.Remoting.Channels.Ipc.IpcClientTransportSink.ProcessMessage(IMess
age msg, ITransportHeaders requestHeaders, Stream requestStream,
ITransportHeaders& responseHeaders, Stream& responseStream) at
System.Runtime.Remoting.Channels.BinaryClientFormatterSink.SyncProcessMessage(IM
essage msg) Exception rethrown at [0]: at
System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg,
IMessage retMsg) at
System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData,
Int32 type) at WDFME.BroadcastEventWrapper.OnBackupEvent(EventType evt) — End
of inner exception stack trace — at
System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object arguments,
SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle
typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(Object target,
Object arguments, Signature sig, MethodAttributes methodAttributes,
RuntimeTypeHandle typeOwner) at
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr,
Binder binder, Object parameters, CultureInfo culture, Boolean
skipVisibilityChecks) at System.Delegate.DynamicInvokeImpl(Object args) at
BackupManager.FireBackupEvent(EventType evt)
Information 5/31/2010 2:59:06 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:59:06 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:59:06 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:59:06 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:59:06 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:59:04 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:58:56 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:58:34 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8296-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8296-5beb-11de-8543-806d6172696f%7D%5C)
Information 5/31/2010 2:57:47 PM 0 WDFME None N/A SYS1-
Verifing tally on [\?\Volume{ff8b8297-5beb-11de-8543-806d6172696f}](file://%5C%5C?%5CVolume%7Bff8b8297-5beb-11de-8543-806d6172696f%7D%5C)