I just noticed a typo in my original post. Checking the Sharing box on the Mac mini server DOES NOT share the recorded content with another Mac running the same version of EyeTV4 on the same network.
I too am experiencing issi=ues with Sharing. I have 4.0 (8520) installed. Checking the Sharing box on my media server Mac mini does present the recorded programs on my laptop with the same version of eyetv installed.