Fucking weird glitch man

No.508510 ViewReplyOriginalReport
I was modeling this fine lady when all of a sudden a huge hole appeared right on her bottom and genital (no jokes pls)

How do I fix this? It's only like this when I turn proxy smooth on. Otherwise, there's no problem with the mesh. The polygons are still there, they're just see-through for some reason. The only material on the mesh is a blinn.