You may need to clear out your exports and re-install that map. I've had an issue like this in the past and re-installing the files worked.
If that doesn't help, try changing your rendering system by going into your 'ogre.cfg' file.
Render System=Direct3D9 Rendering Subsystem
Change this to either what is above or OpenGL Rendering Subsystem.
Hopefully this'll work out for you darlin'.
~ Whisper