Where'd my "Share Screen" ability go?

I have three Macs and quite often use one to access another and another with the "Share Screen" option in the Finder. Simple and easy, been using it since it was implemented and it really is a life saver at times. About two weeks ago two of my systems stopped talking to each other but only in the "Share Screen" option. Here's what I know; I can still access the drives, files etc on my other systems using the finder but not the screen sharing. I have checked and even stopped and restarted all of the sharing options in the Sharing Preferences. Now, the strange part is that my two main systems, a Mac Pro and a Macbook Pro are the ones that won't screen share. My wife's Macbook is still available to be shared by both of my systems. I can access her system anytime from either one of mine but cannot go between mine. It just doesn't make sense. Was there an update recently to the OS or security settings that have affected anyone else? The timing seems to work to be around the time 10.5.8 came out.
Any help would be greatly appreciated.

Okay, so, since my post nothing has changed with my ability to screen share between the three systems. What has changed is I've installed Snow Leopard on the two systems that won't share (but had previously) and also run the permissions check and repair as suggested. So an upgrade to the OS and a permissions repair on both systems but not the third. And still the situation remains that I can't share between the Macbook Pro and my Mac Pro but can share any which way I like from my wife's Macbook that is still just running Leopard.
Not sure if I mentioned or not and if this helps in anyone's possible diagnosis but it's just the screen sharing that isn't sharing. I still have access to the files from system to system but can't share screens.
Thanks again.

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