-It is latest v5 under Win10-64bit.
-Sadly I can not try Now on real scenes, just tried make a simple one(a plane and a sphere) but could not manage to produce the issue again.
-yeah I did use a LUT
-Saved from PV since I use Takes
I can send a link via Pm for my scene If you wanna check into it deeply? I could not figure out what causes the issue.