I assume you using cadimage accessory,
I had a similar issue the other day and only way to fix it was to remake the roof cladding.
What was happening was the cladding was showing up in section 1 & 2 but not section 3, 4 ,5. The weird part was that if I moved section 3 to the location of section 2, the cladding would show up but when I moved it back to its original location, it would disappear again