Screen Sharing (10.6 viewing 10.5) shows a screen of horizontal lines

I use Screen Sharing 1.1.1 on 10.6.4 to access my iBook G4 and my wife's Power Mac G4 (both running 10.5.8).
A week ago I attempted to view the G4 screen. Instead of the normal display, Screen Sharing showed a screen of colored horizontal lines of varying heights. There were a few random blocks with different color lines. Nothing on the screen was recognizable.
The same display problem just occurred with an iChat screen sharing session (iChat 5.0.3 viewing iChat 4.0.8 on the G4). Restarting the G4 cleared up the problem.
My search of Apple Discussions has not turned up a report of this problem.
-- Ward

Hi,
I have not seen this either.
I have 10.5.8 on my G4 and a MacBook Pro running Snow Leopard.
I have heard of issues and can recreate them if my G4 has a second Monitor/screen connected and Mirroring is not On as the iChat Screen Share tries to fit both on to the Shared view (i.e two Screens wide instead of only one.)
I presume the Screen Sharing app would be the same.
Do the G4 users have the Screen Zoomed or any other option set in Universal Access ?
Does changing the resolution in System Preferences > Displays change anything ?
7:13 PM Wednesday; August 25, 2010

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Dear Customer,
Welcome and Thank you for posting your query on HP Support Forum
It looks like you are having issues with the Display of your Notebook. We will surely assist you with this issue
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https://discussions.apple.com/message/10624006#10624006
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