My slabs are invisible/translucent on one floorplan

[Nienke]

I can see all the slabs in 3D and on the other plans, however i cant see the floor from this one floor. when i create new slabs on this floor the same thing happens. Does anyone know how i can make it visible?

 

[Barry Kelly]

Slabs in plan are translucent unless you turn on the option for a 'cover fill' in the floor plan options in the slab settings.

Barry.