Rhino 5 Error: Error while initializing the licensing system. Please see licensing error log for details

Every time I start Rhino 5 64-bit I receive the following error on the command line, but the program loads and seems to run fine:

Error: Error while initializing the licensing system. Please see licensing error log for details

Where can I find the error log and how can I rectify this errant behavior?

Hello - are you running plain Rhino or are there non-default plug-ins loading as well, like renderers or CAM etc,

-Pascal

Pascal,

There are non-default plug-ins, but this behavior is new despite not having changed any plug-ins (I think). Recommendations?

-David

Does that error pop up when you run Rhino in safe mode?

Pascal,

Thank you. It appears that the message is coming from the Autodesk T-Splines for Rhino plug-in.

-David

Yep, there was a notification here not too long ago - see this very long thread