anchor.diff:  
      CALL ReadVar( UnIn, InputFile, p_FAST%VTK_modes%CheckpointRoot, 'CheckpointRoot', 'Name of the checkpoint file written by FAST when linearization data was produced', ErrStat2, ErrMsg2, UnEc )
         CALL SetErrStat( ErrStat2, ErrMsg2, ErrStat, ErrMsg, RoutineName )
  +      
  +   IF ( PathIsRelative( p_FAST%VTK_modes%CheckpointRoot ) ) p_FAST%VTK_modes%CheckpointRoot = TRIM(PriPath)//TRIM(p_FAST%VTK_modes%CheckpointRoot)
         
      if (present(checkpointOnly)) then
         if (checkpointOnly) then
  
positive.code:          return
        end if
     end if
        
     CALL ReadVar( UnIn, InputFile, p_FAST%VTK_modes%MatlabFileName, 'MatlabFileName', 'Name of the file with eigenvectors written by Matlab', ErrStat2, ErrMsg2, UnEc )
        CALL SetErrStat( ErrStat2, ErrMsg2, ErrStat, ErrMsg, RoutineName )
  
negative.code:    ErrMsg  = ""
     UnEc = -1
  
     CALL GetPath( InputFile, PriPath )    ! Input files will be relative to the path where the primary input file is located.
     
        !  Open data file.
     CALL GetNewUnit( UnIn, ErrStat2, ErrMsg2 )
  
  