.libPaths

On Dec 25, 2017, at 5:01 PM, David Winsemius <dwinsemius at comcast.net> wrote:

My guess is that you are running the R.app GUI and have not unchecked the default settings in the Startup panel of Preferences:

Correct that this from the app. It is also consistent with what RStudio shows for .libPaths.
The preferences item, however, is unchecked.
I just tried setting it. Exiting the app. Going back in, unchecking it. Exiting the app. 
After going back in the user lib was still there.