The installed Version "NVIDIA Mental Ray for 3dsMAX 2018" shows a version 1.0.1. But it seems, that MR has a very different code than the previous version.
I have NVIDIA licenses of MR to work with Max2018. MSG 0.0 92 MB error: Texture map "Map #10 ( Forest Color )" is not supported by Mental Ray and will not render. MSG 0.0 71 MB warn : expected structure "E" missing from "m" shader declaration MSG 0.0 71 MB error: The transformation matrix for object "_forest_template_One Plane|Instance(Mesh00)" contains a zero scale in (x/y/z), which is invalid. There are different warning messages from the renderer, which doesn´t came up when I render the same scene in 2017. But some of them only in black (HQ-Plants). In version 2018 the presets for lawn etc. Perhaps the Windows Event Viewer can offer you some guidance.I have bought VRay for some reasons but I also work on older projects with Mental Ray.
If you don't get a crash window then it's probably a hardware conflict of some type, but again. If you get a crash window submit it to Autodesk and they can tell you what module the crash was in if you post your submit # here and perform the ritual to summon an Autodesk employee mention).
Most folks on the forums won't be able to repro your problem and without a supported installer version it's very difficult to help solve this problem. Even NVIDIA won't be able to help provide support. I realize that I'm steering you away from MR and that's not what you want, but it's discontinued and it's time to upgrade your process. That being said you can still fake AO with a gradient ramp and a fresnel falloff with scanline in many cases. It's changed my life when it comes to texturing. Or, I can't say enough positive things about Substance Painter if you haven't tried it yet it'll do what you're asking and way more. Usually a dome light and the default AO in any renderer will look good. AO's baking dirty is simply a function of sampling but it doesn't mean those renders are bad or anything.
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