Getting black screen during screen sharing

I'm setting up another PPC Mac Mini in my home. (All machines run the latest Leopard with updates.) I've pretty much copied all the sharing options from PPC Mac Mini #1 to enable screen sharing on PPC Mac Mini #2. I can screen share fine from Macbook to Mac Mini #1.
However, when I try to screen share with Mac Mini #2, all I get is a very small black screen. However, if I use VNC on my Macbook to the Mac Mini #2, it works fine.
What am I doing wrong?

OK, so I tried the referenced threads from here and none of it works. ARRGH!
http://discussions.apple.com/thread.jspa?messageID=8273469&#8273469
Anyone else have ideas?
I suppose that I could use DynDNS updater and just VNC to this Mac but what's the point of screen sharing if it doesn't work natively? Makes no sense and is very frustrating.
Message was edited by: oldskoolboarder

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