Background Animation Songs Not Working

I downloaded and extracted all of the following songs below and placed it in my C:\Program Files\StepMania\Songs folder:

DDR EXTREME2 Exclusives (391mb)
DDR EXTREME2 Revivals (720mb)
DDR STRIKE (133mb)
DDR ULTRAMIX 2 (472mb)
DS Max (274mb)

I downloaded them from: http://zenius-i-vanisher.com/v5.2/simfiles.php?category=simfiles


I am running Stepmania 3.9b. Please help. When I placed non-background/regular song packs, they worked.