slab not showing up in 3D

[Anonymous]

I have drawn a slab that shows on plan view, but I cannot view this slab in any section or 3D view. I am trying to use SEO's to cut the slab from a mesh, but it doesn't actually show the slab at all in 3D. it seems to be there though but doesn't show up. I have attached a photo of how the slab shows in 3D.

[DGSketcher]

Check your PBC material strengths and also check you haven't used the slab as target and operator in the SEO.