I've ran across what might be a bug in 1.4.11. I use N1MM+ and typically change bands from it rather than in SmartSDR.
While testing NR I noticed if it was on, and I changed bands or modes within the same band, then came back, the setting was not restored, and the level was set back to 0, if this change was initiated from N1MM, but it was persistent if the change was made in SmartSDR.
In case, I cleared the persistence db and the issue changed, so that the NR setting is not persistent either way.
I'm pretty sure it was persistent before with band change from either N1MM or SmartSDR.
It is odd that it was persistent with band change in SmartSDR, then I cleared the db and this was no longer the case.
Maybe something to look into?