Has anyone had problems with flickering backgrounds with Mike Crash's Auto Levels?

Read my post here for more info http://www.dvinfo.net/conf/cineform-software-showcase/238820-field-order-hdv-mpeg2-dvd-output.html

I'm halfway through an HDV1080i project and have used the "Soft colour correction with film levels" preset on a couple of shots.
You scared me so I rendered them out to AVI and they look fine but I haven't viewed on a really large screen. Fingers crossed

Thanks for the response to my question Dugi.
That's good to know.