I've added several Nuget packages to my multi-project solution with no issues. However, when I add this package -- ews.x64 (Exchange Web Services API) -- Nuget does not allow me to add it to any particular project.
The packages subfolder is created normally:
D:\TFSSource\Exchange\Utilities\Src\ExchangePurge\packages\EWS.x64.1.2 but when you attempt to manage the solution's installed packages, the "Manage Nuget Packages" dialog only offers an Uninstall button for this particular package. All the other packages have the Manage button allowing them to be added to the individual projects.
Also interesting is the fact that this package appears in a packages.config file under a newly created solution folder called .nuget? Any ideas what might be causing this?