Screen Sharing Stopped Working Due to Slow Network

I have been sharing the screen of a friend with an iMac. I have an MBP and both our computers have all updates. After I updated her iMac I now longer can share her screen. She can still share mine and I can share my screen with others and I can share other users screens. She is the only one whose screen I can't share.
This started after a number of updates were installed on her iMac. The Connection Doctor says her iMac does not have the capability to share because of slow network connection. I tested the connection and it does not appear to be slow. I have tried a cable yet because it is pretty far from the modem and I need to get a longer cable.
I changed all settings on both computers to the recommendations I read here. Quicktime 1.5 MBps, ichat 500 kb bandwidth, set security to specific and allow ichat. Still cannot share screen of iMac and "slow network" given as reason.

Hi,
If the Quicktiem setting had to be changed iChat will need restarting to "See" that new Speed.
If that has been done you could try deleting com.apple.ichat.plist where this info is held.
WARNING this loses all the other settings made in the Preferences (Fonts, Colours, Balloon or text background colour, Saved Transcripts, Menu Bar Icon, Some iChat 4 specific things - Remember Open Chats Across launch, Name spotting.) and Saved Status Messages.
10:48 PM Saturday; July 18, 2009
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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