I am using <cfflush> to present a "processing" message while the credit card
processor does its thing.

please wait message
<cfflush>
process credit card
output credit card processor results

It works fine on the development server. When I moved it to the production
server, it doesn't appear to flush, i.e. there is no "please wait" message
being displayed while the credit card processor runs. Any clues on why this
might be happening?