There is a knowledgebase article that describes the behavior you are experiencing, but the reason for the behavior in this article is an incorrect installation of Measurement Studio 8.0. I do not believe this is your case, but maybe following these steps will solve your issue as well.
In particular, this article describes that if you try to modify your installation and add, or remove, some of the Measurement Studio components the license files might be created correctly. The following is the knowledgebase article:
Measurement Studio 8.0 not Installing License for .NET Class Libraries
[http://digital.ni.com/public.nsf/websearch/AFE10646333929768625709A00798AD4?OpenDocument]
Please try following these steps and let us know if it fixes the issue.
Regards,
Santiago D