Site-wide Error Handler issue

I'm having a strange one. I'm using CF 9.0, and I have a Site-wide Error Handler set up, with the relative path set correctly.When run-time errors occur, it is calling the template exactly as expected, except for one thing.
In addition to the error template (which shows a nice user-friendly page), I am also getting the default ColdFusion error information following.
So...error occurs, it is throwing to the error template as expected, but then also pushing out the default error page.
It does not do this on CF7 with identical code, so I am thinking that perhaps there is a setting on CF9 Administator that I'm not clicking. But search as I might, I only see the Site-wide Error Handler field.
Any suggestions? This is driving me batty.

ianskinner wrote:
What do you get if you turn on "Robust Exception Information"?
You are presuming that since your test error is a DSN error and this extra message is about a DSN error, that they are the same error. That is an unproven correlation. Or at least you have not show us the proof.
Robust Exception Information is enabled on the Cold Fusion Administrator. I don't know why it wasn't showing earlier, but now when I run the test page I get the following:
The web site you are accessing has experienced an unexpected error.
Please contact the website administrator.
The following information is meant for the website developer for debugging purposes.
Error Occurred While Processing Request
Datasource doesNotExist could not be found.
The error occurred in \\srv238\wwwroot\rjr\errorhandling\cferror_test.cfm: line 11
9 : This query calls a non-existent datasource, triggering an error to be handled. --->
10 :
11 : <cfquery name="testQuery" datasource="doesNotExist">
12 : select * from nothing
13 : </cfquery>
DATASOURCE
doesNotExist
Resources: Check the ColdFusion documentation to verify that you are using the correct syntax.
Search the Knowledge Base to find a solution to your problem.
Browser
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.3; .NET CLR 1.1.4322; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MS-RTC EA 2)
Remote Address
172.21.10.142
Referrer
Date/Time
30-Dec-09 01:21 PM
Stack Trace (click to expand)

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