I was just making an animation, but I noticed some gray bars that appeared out of nowhere when zooming. Before they appeared, I was animating just fine on the same animation. They just came out of nowhere. Attached is a video demonstrating my problem. Help!
To clarify, the gray box was appearing for all kinds of objects, including symbols, bitmaps, etc. However, it seems random, as some objects/bitmaps didn't have the gray box.