Having security issue with SL Screen Sharing

Hello,
Maybe I am missing some new setting in Snow Leopard that increases screen sharing security, but as it is, screen sharing is now insecure on my network.
Prior to Snow Leopard I would log into my Mac from another without selecting the "remember this password in my keychain"... after finishing the session, I would again be asked for my password before ropening a new screen sharing session. All machines on the network were Leopard.
Now, with all macs on the network Snow leopard, on one of the machines I can log on in the morning, work for a while, quit screen sharing, and go back in an hour and start sharing that mac's screen with no password required. Anoyone else can can do this also! I have checked the keychain on the Mac I am viewing from and there does not seem to be an entry there for screen sharing.
On another of the Snow machines it always asks for the password, but on 2 of them, once I have started viewing another Mac's screen a password is no longer required regardless of the fact that I haven't checked that "remember password" .
This means that after I leave a Mac from screen sharing it, someone else has full access to that machine just by clicking on the Share Screen button... unless I can close the hole somehow.
Any ideas or a way to fix this would be appreciated.
Thanks
Jamy

Hi all,
I just upgraded to Snow 10.6.2 so through 2 separate updates, this security hole on all 3 Macs on my network exists.
To test it I went to an office and opened a screen on another (Snow Leopard) Mac that was set up to allow users only to connect. I then quit Screen sharing, and returned 3 hours later, only to be able to open the Hard Disk window and return to that Mac's screen without any passwords required. I was very careful not to allow the Keychain to remember me.
Since I originally posted I see another thread has begun up expressing essentially the same issue.
I would strongly advise anyone who uses Snow Leopard in a secure environment , at least through 10.6.2, to disable screen sharing or risk unauthorized access, or monitoring, of their Macs from within their networks. Screen Sharing's security settings (if they work at all) do not work on Snow Leopard the same as they worked on Leopard.
I have not found a fix for this in the 3 weeks since I first noticed it other than to disable it, or restart the Mac I started the session from, then it will ask for a password, but that is hardly an acceptable fix in some secure or corporate environments (akin to having to restart in order to empty the browser cache when accessing webMail lol)
Regards,
Jamy

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