Did the old Snow White ride have screen shields facing the courtyard? These scrims descend from the ceiling just before the fireworks show in Fantasyland, to guard against debris flying into the line (the attraction - a meet and greet - stays open during fireworks, though the courtyard just beyond is off limits).
I think the scrims are new. EDIT: a friend confirms they were not there originally!
Kevin Yee is the author of numerous independent Disney books, including the popular Walt Disney World Earbook series and Walt Disney World Hidden History.