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On startup the following error message is provided:

SetModified Flag

Object reference not set to an instance of an object.

at vd_user_control.Control1.SetModifiedFlag(Boolean b)

 

This can occur if a version of Microsoft .NET is installed that is not compatible with EnviroInsite.  As of December 2015, EnviroInsite 2014 needs to have Microsoft .NET 4 or later installed. The .NET installation files are available from http://www.microsoft.com/net.