Watlow F4T Driver Broken Run Arrow - Can't load .DLL?

Hello all,

I'm having an issue using the driver for the Watlow F4T temperature controller. I'm using LabVIEW 2015 on Windows 10 Enterprise.

Inside Watlow's driver folder is a project called "Watlow Standard Bus LabVIEW Driver.lbproj". If I open the project I can then open and run "Standard Bus LabVIEW Example.vi" without any issues. If I close the project and open the same vi outside of the project I get a broken run arrow.

I'm getting several Invalid refnum class errors with the details as follows: The refnum class that is being passed into this node is not fully defined. This is because the refnum is defined using external files, and one or more of these files are missing.

When I open the vi through the project I can see Watbus.DLL (C:/Program Files/National Instruments/LabVIEW 2015/instr.lib/Watlow Std Bus/Public/Watbus.DLL) in the .NET Assemblies in Memory window. When I open the vi outside of the project I don't see the Watbus.DLL listed. On the block diagram, when I right click on the reference and choose Select .NET Class and then browse to and select the watbus.dll I get a message saying "An error occurred trying to load the assembly." Any help would be greatly appreciated.

Thanks,

Brian