Been using Mray doing a bunch of tutorials, and opened up a set of project files and kep crashing they removed the paint effects models in architecturtal project and was able to open it but now when i goto setup mental ray it is not available even though i went to the plug in manager and ensured the mayotomir.dll was checked both loaded and autoloaded...So whi is it not available in rendersettings any more and how do I fix it....? Thank you for help only been using maya for a few months Window>Settings/Preferences>Plug-in Manager > tick mayatomr.mll on both those boxes if you want it to auto load next time. Tick just for loaded to load it only in current scene.