Error with tracking logs when build

I frequently get this warning when I run or build a Visual COBOL native or managed project in Visual Studio 2012:

"Forcing a rebuild of all sources due to an error with the tracking logs.  Not a valid Win32 FileTime.  Parameter name: FileTime."

The file referenced is MicroFocus.COBOL.targets

This can get to the point where every time I click on Start to run our application, the project is rebuilt.  Does any one know what causes this warning ?