Screen Sharing dead since update,

Hello,
I've been using Screen Sharing from my MacBook to my MacPro for many months.
Since the latest update - nyet.
When I try to connect using screen sharing, nothing happens. Nothing.
No errors - nothing.
I can use Chicken of the VNC to connect just fine, but it's not the same.
Is it possible to downgrade or reinstall screen sharing?
TIA,
Mike
Message was edited by: brevemike

Thanks for your response.
I can't say which update with specificity.
I believe it was immediately after the 10.5.5 update.
I remember installing the remote client update and hoping that would fix the issue.
I cannot connect to the MacPro from the Macbook at all.
I can connect to the MacPro (both SS and File sharing) from my Mac-mini.
I can connect to the Mac-mini from my Macbook (both SS and File sharing).
I can connect to the Macbook from the Mac-mini.
I cannot connect to the Macbook from the MacPro at all.
I am logging into the admin account (more accurately the only account)
I have checked the screen sharing settings, and nothing has changed.
the firewall has the appropriate ports open and forwarded.
I'm baffled.
It's as if my Macbook and MacPro have just decided to stop speaking to each other. Although I can use 3rd party VNC back and forth.
I suspect something flaky with Bonjour/SS on the Macbook.

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