just a follow up:
without getting into specific details, the problem with AMAT had to do with the way the rate was recorded into our system (the different nomenclature had to partly do with a case when stock is lent out overseas). In any event this made the system believe that it was a hard to borrow. This is a rare case which wasn't originally included in the specs. by now the programming group should have made the changes to prevent it happening again.