I’ve been digging through ULS logs trying to track this down… and I think this is the cause.

06/23/2010 10:39:37.05 w3wp.exe (0×1A00) 0×1B64 SharePoint Foundation Monitoring nasq Medium Entering monitored scope (ExecuteWcfServerOperation) 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.48 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 5229 Information Excel Services Application service is starting. 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.50 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 3sle Medium ExcelServerApp.Initialize(): Excel Server belonging to SSP ExcelServiceApp1 was initialized with AccessModel: Claims 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.50 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 5ox6 Medium ExcelServerApp.ClearTempPath: The Ecs temp path is set to: C:\Windows\TEMP\Excel Server\FileCache\f6f93b2a-fe5f-45bb-8d0c-01eb28b2d23a 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.50 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 5ox7 Medium ExcelServerApp.ClearTempPath: An Ecs temp path already exists, attempting to delete it. 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.50 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 5ox9 Medium ExcelServerApp.ClearTempPath: Attempting to create the Ecs temp path. 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.56 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services qwdq Medium EngineInterop::LoadDll: Failed to load our engine (xlsrv.dll). GetLastError: 126 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.56 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services qwdx Unexpected EngineInterop::LoadDll: Failed to load our engine (xlsrvol.dll). GetLastError: 126 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 89rs Exception ExcelServerApp..ctor: An unhandled exception occurred during boot. Shutting down the server. Microsoft.Office.Excel.Server.CalculationServer.Interop.LoadDllException: Failed to load engine dll.The specified module could not be found. at Microsoft.Office.Excel.Server.CalculationServer.Interop.EngineInterop.LoadDll(EngineFlags engineFlags, String binPath, String muiPath) at Microsoft.Office.Excel.Server.CalculationServer.ExcelServerApp.Initialize() at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock) 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58 w3wp.exe (0×1A00) 0×1B64 SharePoint Server Unified Logging Service c91s Monitorable Watson bucket parameters: SharePoint Server 2010, ULSException14, 5f9be61a “excel services application”, 0e00129b “14.0.4763.0″, 69f888f4 “microsoft.office.excel.server.calculationserver.interop”, 0e001294 “14.0.4756.0″, 4b9b48f9 “sat mar 13 02:12:41 2010″, 00000304 “00000304″, 00000012 “00000012″, 46bf6b31 “loaddllexception”, 38397273 “89rs” 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 7c4s Unexpected HandleShutdown: Initiating shutdown sequence – if there’s enough memory, the logs will now contain information about what went wrong. 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 7c4t Unexpected HandleShutdown: Shutdown was initiated due to an error. Exception was: Microsoft.Office.Excel.Server.CalculationServer.Interop.LoadDllException: Failed to load engine dll.The specified module could not be found. at Microsoft.Office.Excel.Server.CalculationServer.Interop.EngineInterop.LoadDll(EngineFlags engineFlags, String binPath, String muiPath) at Microsoft.Office.Excel.Server.CalculationServer.ExcelServerApp.Initialize() at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock) 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 94jl Unexpected HandleShutdown: HandleShutdown was called from: at Microsoft.Office.Excel.Server.CalculationServer.ExcelServerApp.b__1(Exception e) at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock) at Microsoft.Office.Server.Diagnostics.ULS.SendWatsonOnExceptionTag(UInt32 tagID, ULSCatBase categoryID, String output, Boolean fRethrowException, TryBlock tryBlock, CatchBlock catchBlock, FinallyBlock finallyBlock) at Microsoft.Office.Excel.Server.CalculationServer.ExcelServerApp..ctor() at Microsoft.Office.Excel.Server.CalculationServer.ExcelServerApp..cctor() at Microsoft.Office.Excel.Server.CalculationServer.ExcelServiceBase.SafeSetContext(… 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58* w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 94jl Unexpected …) at Microsoft.Office.Excel.Server.CalculationServer.ExcelServiceBase.BeginProcessOperation(CommandParameter parameter, WebMethodBehaviorAttribute webMethodBehavior, WebMethodType webMethodType, AsyncCallback callback, Object state, UserOperation operation) at Microsoft.Office.Excel.Server.CalculationServer.ExcelServiceSoap.BeginGetHealthScore(AsyncCallback callback, Object asyncState) at AsyncInvokeBeginBeginGetHealthScore(Object , Object[] , AsyncCallback , Object ) at System.ServiceModel.Dispatcher.AsyncMethodInvoker.InvokeBegin(Object instance, Object[] inputs, AsyncCallback callback, Object state) at Microsoft.Office.Excel.Server.CalculationServer.ExcelServiceHostFactory.OperationInvokerExceptionWrapper.InvokeBegin(Object instance, Object[] inputs, AsyncCallback ca… 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58* w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 94jl Unexpected …llback, Object state) at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet) at System.ServiceModel.Dispatcher.ChannelHandler.DispatchAndReleasePump(RequestContext request, Boolean cleanThread, OperationContext currentOperationContext) at System.ServiceModel.Dispatcher.ChannelHandler.HandleRequest(RequestContext request, OperationContext currentOperationContext) at System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result) at System.Servi… 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58* w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 94jl Unexpected …ceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result) at System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously) at System.ServiceModel.Channels.SecurityChannelListener`1.ReceiveItemAndVerifySecurityAsyncResult`2.InnerTryReceiveCompletedCallback(IAsyncResult result) at System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result) at System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously) at System.ServiceModel.Channels.InputQueue`1.AsyncQueueReader.Set(Item item) at System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(Item item, Boolean canDispatchOnThisThread) at System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(T item, ItemDequeuedCallback deque… 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58* w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 94jl Unexpected …uedCallback, Boolean canDispatchOnThisThread) at System.ServiceModel.Channels.InputQueueChannel`1.EnqueueAndDispatch(TDisposable item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread) at System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread) at System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, ItemDequeuedCallback dequeuedCallback) at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, ItemDequeuedCallback callback) at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result) at System.ServiceModel.Activation.H… 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58* w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 94jl Unexpected …ostedHttpRequestAsyncResult.BeginRequest() at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state) at System.ServiceModel.PartialTrustHelpers.PartialTrustInvoke(ContextCallback callback, Object state) at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequestWithFlow(Object state) at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke2() at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke() at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ProcessCallbacks() at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.CompletionCallback(Object state) at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ScheduledOverlapp… 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58* w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 94jl Unexpected …ed.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.ServiceModel.Diagnostics.Utility.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58 w3wp.exe (0×1A00) 0×1B64 Excel Services Application Excel Calculation Services 2026 Warning An internal error occurred. at Microsoft.Office.Excel.Server.CalculationServer.Interop.EngineInterop.LoadDll(EngineFlags engineFlags, String binPath, String muiPath) at Microsoft.Office.Excel.Server.CalculationServer.ExcelServerApp.Initialize() at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock) 435ae9d0-f798-4998-bed6-a5fc3c6d8491
06/23/2010 10:39:38.58 w3wp.exe (0×1A00) 0×1B64 SharePoint Foundation Unified Logging Service 8wsw High Now terminating ULS (w3wp.exe, onetnative.dll) 435ae9d0-f798-4998-bed6-a5fc3c6d8491