IMac sees MacBook Pro, MacBook Pro does not see iMac?

When I click Network in the finder on my iMac it always finds the MacBook Pro. However, when I click network on my MacBook Pro it does not always find the iMac. What is more confusing is that DropCopy works between the two machines no problem, so the MacBook Pro knows the iMac is on the network.
My iMac is connected to an Apple Airport Extreme via Ethernet. I usually have Airport turned off on the iMac, but always on on the MacBook Pro. Turning Airport on on the iMac doesn't make any difference.
Can anybody understand why the iMac only sees the MacBook Pro sometimes? It is not a signal issue as I always have at least 3 bars on the MBP.

I'll take a stab at the why he did post " No Issue w/Leopard".
Because no one posted a reply to his request 33 days ago, and now his issue is solved with new OS.
I think that pretty much answers it.
Now, if someone else has a similar issue, this might cure it as well.

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