odd fringes near twilight in-game

I had some issues recently after uprating NMM to the present version,
though most were easily solved.

except this one.
notice a weird fringe on the edges of the power pole, the roof of the red rocket spa,
and the roof of the manager's penthouse?
it only appears for ~1hr in game near twilight.




Above: a screen cap of early red rocket spa (PC version).
foreground - managers house rebuilt into 'penthouse'
midground left - inner wall and over-ramp prior to no-clip internal elevator overhaul... 'any door anywhere' is an awesome mod! - make the above-ground internal portions ploppable, and only the 'balconies' external - you save a lot of space and get more frame rate.
background center - the above-ground portion of Red Rocket Spa and Resort...
middle, near red-rocket sign - nothing is in that shipping container that you cannot see the garage anymore because of...

I'm thinking this could be a few things;
as I've tried porting this save to other systems to test it in higher end and lower (if you can believe it)
than the system this one is from...
and it could be -
a sign the graphics card of this 2011 computer from which this screendump is on its way out, or worse... the processor cores could have an issue...
worse case scenario.

or, it could simply be associated foible with the
'cel shader mod' which enhances the cartoony features.

we'll figure it out soon enough!
once we figure this one out,
I can troubleshoot the General Atomics Galleria mod.

NB:
here's a few 'any mod any weapon' combos.
Any Mod, Any Weapon is by far one of the most awesome FO4 mods yet known.

 Above: the best pocket plasma chaingun in the game?
59 or 81 round magazine... 1 in 4 shots is free, and you've got a 1 in 16 chance per shot of 'goo-ify',
in addition to 1 in 8 magazines being refilled free...
without the scope or sights, this is 2.5lbs.

the game gets confused as to what color the puddle/ash oughta be - blue or green?

 Above: "Dirty Harold", it can be possible to mod it so it has 2 unique features + kellogg's sidearm + 4 mod slots... that makes this a portable fatman with no collateral damage...
survival mode and "any mod any fail" + weapons durability and 'unreliable ammo" mods,
still, this is one of the better weapons. easier to repair than piperifles, mostly.

 Above: "The Baker's Dozen" - none of that flimsy wooden crud...a full charge can take down a deathclaw. with the EC pack, it gives you a very high fire rate, but burns through ammo cells.
with the EC backpack... you burn through fusion cores slowly, and power cells quickly... you will definitely injure friendlies when this is on 'full auto' mode.

 Above: "you get my point" - this can add cumulative damage per consecutive hit on target, and stun or +50% limb damage. a very nice weapon, and the unfolding animation is pretty funny. it has an 8ft reach, 6ft more than the regular ripper.

 Above: an old friend. the Varmint Slayer rifle returns.
you can get versions that have 2 legendary slots + Reba II's stats.
I still prefer this version though as I lucked out and got a suppressed suppressor variant.
ultra quiet, perfect for survival mode...
though, on survival mode, this is a difficult implement to keep repaired...