Comments

Steve Grisetti wrote on 6/10/2015, 7:59 AM
Does this happen with all of the effects? What model of camcorder is your video coming from? What operating system are you using?

Can you describe what you're doing to apply an effect (in as much detail as possible) and what you're seeing.

Vegas 12 does not apply effects differently than any other version.
rs170a wrote on 6/10/2015, 8:11 AM
Make sure you didn't accidentally click/enable the Split Screen View icon. It's on the top left of the Preview window.

Mike
TheHappyFriar wrote on 6/10/2015, 9:27 AM
some effects may have no settings by default when applied too.
Derm wrote on 6/10/2015, 10:11 AM
If you inadvertently checked "Bypass All", no effect would show, even though you had initiated it