Okay, maybe you guys could help me. I had this problem before while working on older version (2.6), now use this newest 5.2 and it still persist - when I have photos with very strong blue/violet light, I have this odd effect at highlights resembling posterisation. I tried adjusting settings in either base curve, filmic or sigmoid but couldn't get rid of it. Only situation where it does not appear is when I set color profile from "standard/enchanced matrix" to adobe and use "unbreak color profile" module but it cause saturation to drop significantly. This problem does not appear when I open file in NX Studio (I work with D750) so it must be caused by one of DT modules. Could you help me figure out what could be the source of the problem?