10.6.4 Update kills Bonjour Screen Sharing

After 10.6.4 update Bonjour Screen Sharing does not work. Finder shows remote computer on both 10.6.4 machines and file systems are accessible, but I can no longer use Screen Sharing. All else appears OK with update. An iBook G4 running 10.5.8 can access both machines via Screen Sharing just fine. I write this from an iBook using the remote Mac Pro. iStat Nano Pro on iPhone 3GS connects just fine via Bonjour.
Normal usage is Mac Pro running Folding@home (-bigadv -smp 16) 24/7 headless, so this is a problem for me.

The Console view makes even more difficult to figure out because they appear almost identical, yet the 10.6.4 machine fails to connect. There are just two lines of IPv6 addressing, but everything else is the same. The old version works and 10.6.4 does not.
6/17/10 3:57:08 PM Firewall[67] Allow AppleFileServer connecting from 192.168.0.67:49655 to port 548 proto=6 (iBook 10.5.8 connect ok)
6/17/10 3:57:08 PM Firewall[67] Allow AppleFileServer connecting from 192.168.0.67:49656 to port 548 proto=6 (iBook 10.5.8)
6/17/10 3:57:08 PM Firewall[67] Allow AppleFileServer connecting from 192.168.0.67:49657 to port 548 proto=6 (iMac 10.6.4 ok)
6/17/10 3:57:36 PM Firewall[67] Allow AppleFileServer connecting from 192.168.0.82:49973 to port 548 proto=6
6/17/10 3:57:36 PM Firewall[67] Allow AppleFileServer connecting from 192.168.0.82:49974 to port 548 proto=6
6/17/10 3:57:36 PM Firewall[67] Allow AppleFileServer connecting from fe80:5::217:f2ff:fec5:d03c:49976 to port 548 proto=6
6/17/10 3:57:36 PM Firewall[67] Allow AppleFileServer connecting from fe80:4::217:f2ff:fec5:d03c:49975 to port 548 proto=6
6/17/10 3:57:36 PM Firewall[67] Allow AppleFileServer connecting from 192.168.0.82:49977 to port 548 proto=6
6/17/10 3:57:36 PM Firewall[67] Allow AppleFileServer connecting from 192.168.0.82:49978 to port 548 proto=6 (end iMac)
6/17/10 3:59:27 PM Firewall[67] Allow AppleVNCServer connecting from 192.168.0.67:49658 to port 5900 proto=6 (iBook Screen Sharing ok)
6/17/10 4:01:13 PM Firewall[67] Allow AppleVNCServer connecting from 192.168.0.82:49981 to port 5900 proto=6 (iMac Screen Sharing FAIL)
Does anyone see anything in the above Console log other than the IPv6 addressing?
--------to be continued--------------
Folding@home completed is 51+ hour run. In about 30m minutes the first checkpoint will be written and then I hope to reboot into 10.6.3 and try Screen Sharing again.
[22:26:41] + Results successfully sent
[22:26:41] Thank you for your contribution to Folding@Home.
[22:26:41] + Number of Units Completed: 68

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