"Failed to Process NSE" Errors since upgrade to 7.6

I'm a little concerned about the number of "Failed to Process NSE" errors that are appearing in the NS logs since we upgraded to 7.6 HF7 (from 7.5) last week.  The errors all report the same fault.  I've checked the NSE folders on the server and they are all empty (apart from the odd event appearing and then disappearing in the queue).  However, the errors seem to be occuring every minute (with 3 failed attempts each time).  I've not noticed any problems in operation or from the console or client side but the amount of errors and their regularity is worry.  The logs show the following:

[3/3] Failed to process event: # 13942468, 965.00 B, inline
Failed to process NSE.
   [Altiris.NS.Exceptions.AeXException @ Altiris.NS.StandardItems]
   at Altiris.NS.StandardItems.Messaging.InventoryCaptureItem.OnMessageImpl(String message, Boolean useFilename)
   at Altiris.NS.StandardItems.Messaging.InventoryCaptureItem.OnMessageInternal(String message, Boolean useFilename)
   at Altiris.Deployment.Messaging.ILOInventoryCapture.OnMessage(String message)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.DispatchWithinContext(String message, Boolean useFilename, IItem item, IItemMessaging iim, MessageHeader header)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.DispatchWithinContext(Int32 eventQueueId, String message, Boolean useFilename, Int64 fileSize, Int64 eventId, MessageHeader header)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.TryDispatch(Int32 eventQueueId, String message, Boolean useFilename, Int64 fileSize, Int64 eventId)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.PerformDispatch(DispatchSlot slot, Boolean& fatal)

Exception of type 'Altiris.NS.TaskManagement.TaskStoppedException' was thrown.
   [Altiris.NS.TaskManagement.TaskStoppedException @ Altiris.NS]
   at Altiris.NS.ResourceManagement.MessagingResource.SaveImpl(Boolean allowUpdate)
   at Altiris.Database.DatabaseContext`1.RetryAction(Int32 retries, Boolean transacted, Getter`1 getContext, Action`1 action, Action`1 retry, DeadlockRetryArgs& re, Exception& exception, Boolean inTransaction)
   at Altiris.Database.DatabaseContext`1.PerformWithDeadlockRetryHelper(Int32 retries, Boolean inTransaction, Getter`1 getContext, Action`1 action, Action`1 retry, Boolean transacted)
   at Altiris.Database.DatabaseContext`1.PerformWithDeadlockRetry(Int32 retries, Boolean startNewTransaction, Nullable`1 isolationLevel, Boolean independentContext, Action`1 action, Action`1 retry)
   at Altiris.NS.ResourceManagement.MessagingResource.Save()
   at Altiris.NS.StandardItems.Messaging.InventoryCaptureItem.SeekResourceImport(String message, Boolean useFilename, String[] conditionBodyInventoryResources, XmlTextReader xmlReader, ArrayList parseStack, MessagingResource& fromResource, ResourceImporter& resourceImporter)
   at Altiris.NS.StandardItems.Messaging.InventoryCaptureItem.OnMessageImpl(String message, Boolean useFilename)

Exception logged from: 
   at Altiris.Diagnostics.Logging.EventLog.ReportException(Int32 severity, String strMessage, String category, Exception exception, String footer)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.HandleException(DispatchSlot slot, Int32 i, Exception ex, String& file, Boolean& fileInline, Int32& retryLimit)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.PerformDispatch(DispatchSlot slot, Boolean& fatal)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.WorkerDispatchStep(DispatchSlot slot, IAutoCallContextSnapshot snap)
   at Altiris.NS.ClientMessaging.EventQueueDispatcher.DispatchSlotThreadProc(Object state)
   at System.Threading.ThreadHelper.ThreadStart(Object obj)

**CEDUrlStart** :http://entced.symantec.com/entt?product=SMP&version=7.6.1383.0&language=en&module=euBqK19WCe54FvBZsBlgjvQJ267PbV6Sgdiy6+3auzijphNgVSieNz92uK9ygPCSfkXVwdKDinbB/I5D2ba2rQ==&error=-298970188&build=**CEDUrlEnd**

-----------------------------------------------------------------------------------------------------
Date: 11/03/2016 10:17:20, Tick Count: 42037515 (11:40:37.5150000), Host Name: xxxxxx, Size: 3.45 KB
Process: AeXSvc (1268), Thread ID: 43, Module: AeXSVC.exe
Priority: 1, Source: EventQueueDispatcher
File: C:\ProgramData\Symantec\SMP\Logs\a.log

Can anyonce decipher that and point me to the problem?