We are seeing the same issue but get the following in the log file:
ClientConnectionId:847d677c-e7f9-48f9-ac8b-76b84c84258f
Error Number:207,State:1,Class:16
[2015-08-25 15:49:30.627] Process: w3wp |Organization:394017ba-646a-4fbb-8b82-304746924281 |Thread: 390 |Category: Exception |User: 124719f8-a9b1-4695-aeb6-5818d73103fb |Level: Error |ReqId: e75feed1-50fb-401a-9c88-c3ef6a0204dc | CrmException..ctor ilOffset = 0x7
at CrmException..ctor(String message, Exception innerException, Int32 errorCode, Boolean isFlowControlException) ilOffset = 0x7
at CrmException..ctor(String message, Exception innerException, Int32 errorCode) ilOffset = 0x5
at RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) ilOffset = 0xFFFFFFFF
at RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) ilOffset = 0xF7
at RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, StackCrawlMark& stackMark) ilOffset = 0x1E7
at Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) ilOffset = 0xBB
at Activator.CreateInstance(Type type, Object[] args) ilOffset = 0x39
at VersionedPluginProxyStepBase.WrapExceptionToThrow(CrmException exception) ilOffset = 0xA5
at VersionedPluginProxyStepBase.Execute(PipelineExecutionContext context) ilOffset = 0x65
at PipelineInstrumentationHelper.Execute(Boolean instrumentationEnabled, String stopwatchName, ExecuteWithInstrumentation action) ilOffset = 0x2D
at Pipeline.Execute(PipelineExecutionContext context) ilOffset = 0xD8
at <>c__DisplayClass1.<RunStage>b__0() ilOffset = 0x0
at PipelineInstrumentationHelper.Execute(Boolean instrumentationEnabled, String stopwatchName, ExecuteWithInstrumentation action) ilOffset = 0x2D
at MessageProcessor.RunStage(PipelineExecutionContext context, Int32 pipelineStage) ilOffset = 0x39
at MessageProcessor.Execute(PipelineExecutionContext context) ilOffset = 0x171
at InternalMessageDispatcher.Execute(PipelineExecutionContext context) ilOffset = 0xE4
at ExternalMessageDispatcher.ExecuteInternal(IInProcessOrganizationServiceFactory serviceFactory, IPlatformMessageDispatcherFactory dispatcherFactory, String messageName, String requestName, Int32 primaryObjectTypeCode, Int32 secondaryObjectTypeCode, ParameterCollection fields, CorrelationToken correlationToken, CallerOriginToken originToken, UserAuth userAuth, Guid callerId, Guid transactionContextId, Int32 invocationSource, Nullable`1 requestId, Version endpointVersion) ilOffset = 0x16E
at OrganizationSdkServiceInternal.ExecuteRequest(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType, UserAuth userAuth, Guid targetUserId, OrganizationContext context, Boolean returnResponse, Boolean checkAdminMode) ilOffset = 0x1EE
at OrganizationSdkServiceInternal.ExecuteRequest(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType, Boolean checkAdminMode) ilOffset = 0x2D
at OrganizationSdkServiceInternal.Execute(OrganizationRequest request, CorrelationToken correlationToken, CallerOriginToken callerOriginToken, WebServiceType serviceType, Boolean checkAdminMode) ilOffset = 0x26
at InprocessServiceProxy.ExecuteCore(OrganizationRequest request) ilOffset = 0x34
at PlatformCommand.XrmExecuteInternal() ilOffset = 0xF6
at UpdateCommand.Execute() ilOffset = 0x7
at DataSource.Update(EntityProxy entity, Boolean performDuplicateCheck, Guid auditingTransactionId, IOrganizationContext context) ilOffset = 0x11
at EntityProxy.Update(Boolean performDuplicateCheck, Guid auditingTransactionId) ilOffset = 0x0
at EntityProxy.Update(Boolean performDuplicateCheck) ilOffset = 0x7
at EntityProxy.UpdateAndRetrieve(String[] columnSet, Boolean performDuplicateCheck) ilOffset = 0x0
at CommandBase.UpdateEntity(Entity entity, Boolean retrieve) ilOffset = 0xD1
at SaveCommand.ExecuteCommand(String commandXml) ilOffset = 0x116
at CommandBase.Execute(String commandXml) ilOffset = 0x13
at InlineEditWebService.Execute(Int32 command, String commandXml) ilOffset = 0xD0
at RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) ilOffset = 0xFFFFFFFF
at RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) ilOffset = 0x25
at RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) ilOffset = 0xCF
at LogicalMethodInfo.Invoke(Object target, Object[] values) ilOffset = 0x4F
at WebServiceHandler.Invoke() ilOffset = 0xC3
at WebServiceHandler.CoreProcessRequest() ilOffset = 0x13E
at SyncSessionlessHandler.ProcessRequest(HttpContext context) ilOffset = 0x39
at HandlerWrapper.ProcessRequest(HttpContext context) ilOffset = 0x7
at CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() ilOffset = 0x18D
at HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) ilOffset = 0x15
at ApplicationStepManager.ResumeSteps(Exception error) ilOffset = 0x10A
at HttpApplication.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) ilOffset = 0x5C
at HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) ilOffset = 0x16A
at ISAPIRuntime.ProcessRequest(IntPtr ecb, Int32 iWRType) ilOffset = 0x4B
>Crm Exception: Message: Generic SQL error., ErrorCode: -2147204784, InnerException: Microsoft.Crm.CrmException: Generic SQL error. ---> System.Data.SqlClient.SqlException: Invalid column name 'Level'.
Invalid column name 'Level'.
Invalid column name 'Level'.