No data found in csv output

I have a classic (non-interactive) report that shows some strange behaviour.
It's a simple page with a report region.
On the report attributes page under 'report export' the value for 'Enable CSV output' is set to 'Yes' and 'Link label' has a meaningful discription.
In the development database it works as expected:
When I run the page the data is displayed and when I click the link for csv output I can either save or open the file. In both cases I find the data I expect in the csv file.
In production, however, when I run the page the data is displayed, but when I click the link for csv output the resulting csv file just shows "No Data Found"
I can imagine the report not returning any data, but in that case I shouldn't see any data on screen either.
And it's extra weird that in development it all works fine.
Anybody that can offer any help?
Thanks in advance.

Hi Eric
I would never dream of telling anyone not to argue with me :D I've been wrong before and will be again, no doubt!
For the DIV problem, I was more concerned with < appearing in the output rather than the SQL statement itself - generally problems such as this happen when something on the page is incorrectly formed. When you get a chance, in FireFox, install the Web Developer add-on. When this is installed, on the right-hand end of its toolbar, you will see three buttons - the last two tell you about css and javascript errors. For HTML errors, if you have a text editor that has syntax highlighting, do a View Source on the loaded page, take a copy of the source and paste it in to a new document in the text editor. Save this with an HTML file extension. This should colour-highlight everything. It should become obvious what is wrong as you tend to end up with way too much in the same colour. Finally, on the loaded page, right-click on the DIV text and select Inspect Element - this switches you to a heirarchical view of the HTML on the page in the FireBug pane. Follow the tree up from the DIV and have a look at the structue - at some point, something will look wrong.
Andy

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