Code behaves differently when run in debugger

Question

var he:Array = handControl.getHumanInfo(ha, handNumber);
while (he.length != 0)
humanInfo.push(he.shift());
This snippet is part of a large flash project I am working
on. The program works fine by itself, but when I try to step
through it in the debugger, it sometimes crashes, depending on
where I put a breakpoint. If I put the breakpoint on the first line
of code above, I can step into the function getHumanInfo(), trace
it, and step back out, and everything is fine. But if I only put a
breakpoint somewhere inside the getHumanInfo() function, all of a
sudden when I step out of that function, the variable 'he' is
undefined, and so the while loop never ends.
This makes no sense to me. The code is either good or bad, it
shouldn't behave differently based on where I put the breakpoint.
The getHumanInfo() function always creates a new array and
passes it back, so there is no reason 'he' should be undefined.
This has happened many times when I've tried to use the flash
CS3 debugger -- is there a known issue that this sounds like? I'm
so fed up I'm ready to stop using the debugger altogether.

Answer 1

I ran the program without the debugger and put some trace()
statements in, just to make sure. Everything works fine without the
debugger. So it seems to me it has to be a debugger issue. Has
anyone heard of a similar issue?