Fillets again

 From:  Apophis

My work is done :-)
Step by step with fabulous description.
Two questions stay. First the image below. The edges in the middle ( red arrow ) couldn't be used with fillets. I don't know why, because there are the same edges like in PaQ's Turtorial.
I've a suspicion. My workstation
(Computer Intel(R) Core(TM)2 CPU 6420 @ 2.13GHz 2.05 GHz, 2,00 GB RAM with Winxp seems to be overstrained. Is MoI developed for dual core processor? Any activity with bigger meshes work very slow. If I compare my MoI and the application from PaQ there are many differences.