Screen sharing in ichat 4 works on my MacBook Pro and does'nt work on imac

I am outside the US and Canada and I have a MacBook Pro and 3 imacs, 2 at my office and 1 at home. I used to use screen sharing among all of them but suddenly the imac at home does not allow sharing its screen, it only can share screens on other units, the (share my screen with...) command is faded but all other ichat features like video, speech and text are fine.
I reinstalled ichat again thinking that it could be corrupted but it is still the same.
I don't have a network or a firewall problem because when I use the same wireless network at home and login with my MacBook, the MacBook works perfectly.
I matched the settings of all units but still no progress.
I need help to restore that feature again.

If this happensd in the future go to USers/(your account)/Library/Preferences.
Delete com.apple.ichat.plist and restart iChat
If that does not work delete com.apple.ichatAgent.plists and restart iChat
It will be one or the other most likely the second.
Deleting them one at a time with a restart will pin point which one it is.
8:15 PM Sunday; December 16, 2007

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Message was edited by: TheRealLexxy

HI,
Thomson-Alcatel, to give them their Full name, make the Speedtouch Series of Modems
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