I have known about this conflict for quite some time now, with the 20.x series only.
Warning NIS 20.3.0.36 NOT compatible with MalwarebytesHowever, this would be the first time I have heard users stating that the 19.x line is now affected also!
I will report back if I see any warnings or conflicts. So far zilch.
EDIT1: Forgot to mention that I am running Windows 7 SP1 64-bit.