Screen sharing across snow leopard macs is unpredictable

Ok,
This is independent on the wake on wireless setup.
I have successfully upgraded 3 macs at home - one 2007 generation mac mini (connected to TV), one 2009 generation mac mini (in the office), and a 2009 mac book pro that roams with me. All have been upgraded to Snow Leopard. The two mac mini's did a standard SL upgrade; the mac book pro did a fresh SL install (I reformatted the disk first).
Here's the problem = regardless of whether the mac's are sleeping or not, I get intermittent problems when trying to use the 'Share Screen" features. I do have Back to Mac turned on on all three. On each of the two mac minis I have one account that can screen share, and when I try to connect from my MBP to share the screen, the login box pops up and I put in the right credentials. Then, that little wheel in the lower left corner of the left hand box starts spinning, but it never connects. The connect and cancel buttons are grayed out - so I can't cancel. Even after 15 minutes, it never connects and there is no way to kill the login box without restarting - even relaunching the finder does not cause the login box to quit (nor does quitting the screen sharing application in the dock).
Is this a bug?

There is definitely a problem - all three macs are on SL and each of them is experiencing this problem. I am running a 2008 1tb time capsule that has the current firmware. The only way I can connect is if I go directly to the mac I'm trying to connect to and change the 'share screen' permissions to 'all users' and then back to the 'just these users' that have permissions. Then, I can connect ok for another 10 or fifteen minutes, but after that the problem happens again.
The firewalls are turned off on all machines.
I can't kill the login screen that continues to try to connect without restarting the machine. If I kill the share screen program, the program terminates but the login box continues to show on the screen and it sits on top of all windows. Very annoying.

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