I'm assuming you do have other vfxs (stationary ones that work?) if not try to set some up, the feature uses windows aero if that somehow gets disabled it breaks all vfx.

At this point I'd set up a manual round robin, step 1 box 1, step 2 box 2, step 3 box 3 etc. I think mirai was right and it was (before) just opening 5 feeds on top of each other.