Okay, I DO have TTW Fixes installed, I don't have yup installed and I have the exact same issue he does. I have project nevada and the associated compatiability patches included TTW.
I also have JIP companion control mod.
Updating NVSE, the JIP LN didn't solve the issue, but removing the JIP files from the NVSE folder did solve the issue as did reverting to version 50.50 or earlier. Yes I tested to find the exact moment it fails, skipping three or four versions at at time. That version was released August 14th, so its a fairly recent issue.
