I've been having a rather odd problem with smart fasteners. After creating a hole in my part with the hole wizard, attempting to use a fastener from smart fasteners when in assembly constantly gives 'rebuild errors'. Upon closer inspection, there seem to be problems with the library files, but I'm not sure exactly what's going on, as putting in fresh files from the solidworks install doesn't seem to work either. I'm using the default suggestions put out by smart fasteners. As well, it seems to happen the most with fasteners with hexagonal components. Attached is a screenshot.