Debug anonymous block (Toad 10.6.0.42)

I am new to debugging with Toad, though I have been using Toad, Oracle and PL/SQL for years.

Using Toad 10.6.0.42 with no add-ons, I have converted sample loopproc into an anonymous block and saved it as loopproc.prc:

DECLARE
   tmpvar    NUMBER;
   tmpvar2   NUMBER;
   total     NUMBER;
BEGIN
   DBMS_DEBUG.SELF_CHECK;
   tmpvar := 0;
   tmpvar2 := 0;
   total := 0;

   FOR lcv IN 1 .. 100 LOOP
      total := 2 * total + 1 - tmpvar2;
      tmpvar2 := tmpvar;
      tmpvar := total;
   END LOOP;

   DBMS_OUTPUT.put_line('Total is ' || total); 
END ;

When I try to debug this, I am only able to set a breakpoint at the DECLARE statement.  When I press "Trace Into," the proc will stop at the DECLARE, but subsequent use of "Trace Into" runs to completion without stopping.  Is this expected behavior?  What might I be doing wrong?

By the way, I do not see a "Compile with Debug" option on my toolbar, nor under Commands in Customize Toolbar.  And I'm not certain of my access to DBMS_DEBUG, but given that the SELF_CHECK line runs without error - and the fact that I can set a breakpoint at DECLARE - and it does seem to break there - I think (?) that is not the issue.

Thanks,
Dennis

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