Maybe put on 4.2.7 firmware N7100XXUFNС2?
If possible, how?
1) flash 4.2.7 kernel.
2) cleaned cache and dalvik cache.
3) flash PSN_AGNi_MALI400_r3p2_blobs
There are other apps which have the same issue, such as Asus launcher (preferences tab)
Those are default switch on/off icons,there is no problem with your ROM
Sent from my SM-N910C
Just tried 4.3.9. Like 4.3.8, UPSM doesn't go into grayscale, even with all MDNIE settings off. Now back to 4.3.7r2
grayscale everything works fine
is not a shade of gray
sorry for bad English.