the maya log says something like:

1/27/2007
mental ray for Maya 8.0
// mental ray for Maya: using startup file E:/Programme/Autodesk/Maya8/mentalray/maya.rayrc
mental ray for Maya: setup
mental ray for Maya: initialize
mental ray for Maya: using 1 license
mental ray for Maya: register extensions
// mental ray Node Factory: loaded
mental ray: version 3.5.1.2, 15 Jun 2006, revision 18552
// parsing E:/Programme/Autodesk/Maya8/mentalray/include/base.mi
// loading E:/Programme/Autodesk/Maya8/mentalray/lib/base.dll
// generating Maya nodes...
// parsing E:/Programme/Autodesk/Maya8/mentalray/include/contour.mi
// loading E:/Programme/Autodesk/Maya8/mentalray/lib/contour.dll
// generating Maya nodes...
// parsing E:/Programme/Autodesk/Maya8/mentalray/include/paint.mi
// loading E:/Programme/Autodesk/Maya8/mentalray/lib/paint.dll
// generating Maya nodes...
// parsing E:/Programme/Autodesk/Maya8/mentalray/include/physics.mi
// loading E:/Programme/Autodesk/Maya8/mentalray/lib/physics.dll
// generating Maya nodes...
// parsing E:/Programme/Autodesk/Maya8/mentalray/include/subsurface.mi
// loading E:/Programme/Autodesk/Maya8/mentalray/lib/subsurface.dll
// generating Maya nodes...
// parsing E:/Programme/Autodesk/Maya8/mentalray/include/surfaceSampler.mi
// loading E:/Programme/Autodesk/Maya8/mentalray/lib/surfaceSampler.dll
// generating Maya nodes...
mental ray for Maya: successfully registered
mental ray for Maya: loading startup file: E:/Programme/Autodesk/Maya8/mentalray/maya.rayrc
mental ray: mental ray for Maya - startup done
File read in 15 seconds.
Warning: Can't perform Walk4:polyCut17 on disabled selection
Warning: Can't perform Walk4:loopSplit2 on disabled selection
Warning: Can't perform Walk4:loopSplit3 on disabled selection
Warning: Can't perform Walk4:polyCut24 on disabled selection
Warning: Can't perform Walk4:polySplit18 on disabled selection
Warning: Can't perform Walk4:polySplit19 on disabled selection
Warning: Can't perform Walk4:polySplit20 on disabled selection
Warning: Can't perform Walk4:polySplit21 on disabled selection
Warning: Can't perform Walk4:polySplit23 on disabled selection
Warning: Can't perform Walk4:polyCut26 on disabled selection
Warning: Can't perform Walk4:polyCut27 on disabled selection
Warning: Can't perform Walk4:polyDelEdge1 on disabled selection
Warning: Can't perform Walk4:polyDelEdge2 on disabled selection
Warning: Can't perform Walk4:polyDelEdge3 on disabled selection
Warning: Can't perform Walk4:polyDelEdge4 on disabled selection
Warning: Can't perform Walk4:loopSplit4 on disabled selection
Warning: Can't perform Walk4:polySubdEdge2 on disabled selection
Warning: Can't perform Walk4:polySplit25 on disabled selection
Warning: Can't perform Walk4:polySplit26 on disabled selection
Warning: Can't perform Walk4:polySplit27 on disabled selection
Warning: Can't perform Walk4:polyMergeVert2 on disabled selection
Warning: Can't perform Walk4:polyCut29 on disabled selection
Warning: Can't perform Walk4:polyCut31 on disabled selection
Warning: Can't perform Walk4:polyCut32 on disabled selection
Warning: Can't perform Walk4:polyCut33 on disabled selection
Warning: Can't perform Walk4:polyCut34 on disabled selection
Warning: Can't perform Walk4:polyCut35 on disabled selection
Warning: Can't perform Walk4:loopSplit on disabled selection
Warning: Can't perform Walk4:loopSplit1 on disabled selection
Warning: Can't perform Walk4:multiLoopSplit on disabled selection
Warning: Can't perform Walk4:polyCut8 on disabled selection
Warning: Can't perform Walk4:polySplit14 on disabled selection
Warning: Can't perform Walk4:polySplit15 on disabled selection
Warning: Can't perform Walk4:polySplit28 on disabled selection
Warning: Can't perform Walk4:polySplit29 on disabled selection
Warning: Can't perform Walk4:polySplit30 on disabled selection
Warning: Can't perform Walk4:polySplit31 on disabled selection
Warning: Can't perform Walk4:polySplit32 on disabled selection
Warning: Can't perform Walk4:polySplit33 on disabled selection
Warning: Can't perform Walk4:polySplit34 on disabled selection
Warning: Can't perform Walk4:polySplit35 on disabled selection
Warning: Can't perform Walk4:polySplit36 on disabled ...........