It appears that the issue was caused by an ‘EnableCab=”Yes”‘ value in a cfform tag.
Interestingly enough, though, the EnableCab value was not set on that page or even the preceding page.
There was an occurrence of the ‘EnableCab=”Yes”‘ many pages earlier.
So, it appears that you can have absolutely NO occurrence of ‘EnableCab=”Yes”‘ anywhere in the application or the server will attempt to send the cab files to the client’s browser.