Often times we get cases where we need the complete stack trace of an error and not what is reported by any custom error handler template.
Here is a great way to track your errors that also allows inspection of the entire cfcatch structure at a later time, without interfering with any custom templates.
<cfdocument filename="errorreport#gettickcount()#.pdf" format="pdf">
ColdFusion Error<br />
In the above code I create a missing template exception, then have the cfcatch simply use cfdocument with a unique filename, to dump out the cfcatch to a PDF file.
You can adjust the location etc as you see fit of course.
The result is a PDF for every occurence showing the complete error and hopefully allowing you to quickly get to a resoluiton.