conversion to mol2 format

Dear cclers,
  I was trying to convert a pdb file to mol2 format using babel 1.6. The
 job does not get done.its happening with all pdb files.. conversion to
 other formats like mol takes place easily. When I try to convert it to
 mol2 format the program just does not finish.Could any one please tell me
 whats the problem here. Any help is appreciated.
 Chinmoy Ranjan.
                         CHINMOY RANJAN
                         V YEAR
                         INTEGRATED MSc CHEMISTRY
                         INDIAN INSTITUTE OF TECHNOLOGY