Occasional crash when changing workspaces

[GrumpyTrader]

Here is the relevant trace log portion with the file lock error. I just replaced my home directory name with ****

2016-03-08 07:20:13:893 *************** unhandled exception trapped ***************
2016-03-08 07:20:13:893 The process cannot access the file 'C:\Users\****\Documents\NinjaTrader 8\db\day\TF 03-16\2016.Last.ncd' because it is being used by another process.
2016-03-08 07:20:13:897 System.IO.IOException: The process cannot access the file 'C:\Users\*****\Documents\NinjaTrader 8\db\day\TF 03-16\2016.Last.ncd' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalDelete(String path, Boolean checkHost)
at NinjaTrader.Data.BarsSeries.Save()
at NinjaTrader.Cbi.Instrument.<>c__DisplayClass189_0. <RequestBars>b__1(Object o)
at System.Threading.ExecutionContext.RunInternal(Exec utionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionCon text executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System. Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()

[NinjaTrader_PatrickH]

Hello GrumpyTrader,

Thank you for your post.

Temporarily disable security software and ensure any backup software is not running while running NinjaTrader. If you do not see the errors again make sure to add an exception for NinjaTrader 8 in your security software.