I can't see the object mesh?

Hello! I've recently got a new laptop and downloaded S4S onto it, and tried working on some recolors I'd been toying with on my old laptop.  However, I can't see the entire object mesh now - it acts as if there's some sort of barrier in the way preventing me from seeing things fully.  I've never seen anything like this before, and it's not something wrong with my old recolor files, because the same issue is happening with new objects as well, as seen in this screenshot.

Does anyone have any idea what's going wrong?