Hi guys

Can anyone tell me why I can't fillet these edges properly. As you can see from the screen shot it will fillet to some degree but still keeps the sharp edge and does something else funny around it.. I have been playing with this shape for a while now (even though this file has been recently generated) and haven't had this problem with fillets in other areas. I've also united this object after boolean difference to knock out the shape in the dome.

Thanks for help guys

Lang