i found an solution for guys who couldnt manage to render with mr 
its simple, and this is for maya 2014 solution,
as we all know, mr is now separated from maya install and location of mr is in program files/autodesk
so when fumefx installs shaders for mr, installer copy them to maya/mentalrayForMaya2014
but for some reason mr cant see this location…
all u need to do is to copy from mentalrayForMaya2014 dir shaders directory to c:\Program Files\Autodesk\mentalrayForMaya2014\ or where ur mr location is
and have fun
hope this helps
cheers

