chd files and advmame

I was using mame32 with a set of working rom files with no problems.  I recently decided to put a cab together with the lastest version of advmame.  I can no longer play any of the games that use chd files...  I receive an error that the chd doesn't exist when it does, for the rom dir structure hasn't changed.  Are the roms version dependent?  Are the rom name / dir case sensitive????  I'm confused.  Any help would be greatly appreciated.
   
  Thanks,
  Charlie
   

		
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