Mark,

I believe the problem is that you are scheduling the command from the 
excfull.smp script which is shipped with the client.  This command is pasted 
from that script.

start /B tdpexcc backup * full /tsmoptfile=dsm.opt /logfile=excsch.log >> 
excfull.log

When you run the start /B it opens a new command window so when you run a query 
event it shows that the schedule acually has completed becuase the script has 
completed by opening the new window.  Remove the Start /B and it should help 
you.  

Eric Gruber
TSM Certified Consultant TSM