It's interesting to see that you see the entire 1011-base.pln in the INS when you load the L-1011 into P3dv4.  I only see KJFK in the INS, but in the Flight Planner, I see the entire route.

As an exercise, rename/backup the 1011-base.pln  (found in the Documents\Prepar3D v4 Files), then retry my saved flight. You might even want to try the default flight KVPS to KJFK, and see if the INS will at least track that route.

I just tested renaming the 1011-base.pln, and was surprised to find that the INS still worked fine for me! :O

Over the last couple of weeks, I have downloaded the installer, csy112_1000.exe, several times. Unistalled/reinstalled the 1011 II Captain several times. Tested with/without the Hotfix 1001, and the Hotfix 1002, and yet for all that, I'm not having any major troubles with the INS.