Adlagent 2.6-74 on OS X

Has anyone experienced problems with the latest Adlagent 2.6-74.Darwin on OS X workstations (Leopard or Panther)?  All my jobs are now failing with "Undefined exit code: 256"  If I uninstall the 2.6-74 client and reinstall the 2.6-67.Darwin client the jobs work properly again. Below are screen captures of the log files from:
 
a machine running the 2.6-74 agent (job fails)

and the 2.6.67 agent (job completes successfully) 

It appears the script never gets transferred to the workstation.