Yes that's exactly what happened to me so I did the clean install of 7.1.1 let the phone update completely via the OTA to the k build then I installed TWRP and SuperSU and I've had no issues since. I did have to fully unroot again to get Snapchat installed and logged into and then rerooted all is well now
---------- Post added at 05:15 PM ---------- Previous post was at 05:12 PM ----------
Sounds like you had some data carry over when you reverted ...I had the same FC and when I went to developer options it said it wasn't available for that user..I only had one user so not quite sure where all that was coming from but once I installed 7.1.1 again with the -w included I was fine
Hmm.. I never removed the -w. Let me run you through the steps I took to see if there is anything I might have done wrong.
1. Reverted to 7.1.1 NOF27B with the flash-all.bat
2. Noted that I was on slot A
3. Took OTA update for K build
4. Rebooted into Bootloader and noticed that slot had switched to B, 7.1.2 got pushed into slot B although I had taken the update through slot A.
5. Switched back to Slot A and noticed that it was still on 7.1.1 and force closing constantly.
6. Took OTA again through slot A, but once again it did not stick and slot got switched to B.
Note that this only happens with the K build I did not have this issue when I flashed N2G47E originally.