I think I know exactly what has caused it.................I had decided to try line-breeding (Muffin and Splodge are half brother and sister). After doing a lot of research into their pedigrees and finding that they were faultless and extremely good quality Persians, I decided to give it a go. I could be completely on the wrong track and it could just be a problem with the mother, but it makes you wonder, doesnt it ????????????????