Dumb question about error messages

[graham samuel]

I'm debugging an app in the IDE. I have a 'startup' handler that 
doesn't run in this context, so I execute

send "startup" to stack "myStack"

This is standard procedure for me. Today there was a bug in my handler, 
and a message in the lower half of the message box saying

Message execution error:
Error description: Chunk: no such object

Doubtless this is true - my code is not faultless :) - but why don't I 
get the standard error dialog opening up to give me a clue as to where 
in the script of the handler the error occurs? The IDE option 'script 
debug mode' is checked. As it is I will have to set breakpoints to 
narrow down the issue - but what did I do wrong? I can't believe I'm 
asking this question after all this time working with RR.

TIA

Graham
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Graham Samuel / The Living Fossil Co. / UK and France