Sorry I was talking about my own files. There is another thread about the same issue viewtopic.php?f=9&t=3354. When I adjust the layer from 0.2mm to 1.9mm the holes open up again but like I said its only happening on one layer in my model.
I have the same hole filling issue but it does it for only one layer. It does it for one layer when the layer is set @ 0.2mm, when printing at 0.1mm layer it does not do it. When I set the layer to 0.3mm it even fills the large holes. There is nothing wrong with the model mesh.