Problem Screen Sharing with my grandma.

I am having trouble screen sharing with my grandmother's computer. I have a brand new Mac Book Pro 15-inch, 2.4 GHz Intel Core 2 Duo processor, 2 GB of memory with Mac OS X 10.5.1 . I bought my computer and my grandmother's back in October right after Leopard was released. She has a brand new iMac 20-inch, 2.4 GHz Intel Core 2 Duo processor, 2 GB of memory with Mac OS X Leopard 10.5 .
We have been talking over video/audio chats using AIM for quite some time now with no problems other then an occasional internet problem (audio or video skips for a second or audio/video quality is bad for a few seconds). She is used to Windows so I have had to show/explain the basics of a Mac and every time she has a problem with something I try to help her by walking her through it, but it would be really nice if I could just do it myself through Screen Sharing. We have tried to share her screen but it comes up with and error message every time.
I have looked at the things that people are saying about how to fix your problem with screen sharing and I have tried most of them but they don't seem to be working. Maybe I am just missing something.
Please help me get this to work.

As you say there is nothing Specific in the Info about Fair Usage.
However the things you can not do are not so specific and could be stretched to cover what you want to do.
However it would depend on how actively they searched the data traffic for the things that might be interpreted as P2P file sharing and the from it takes.
As you can Video to some and Not Screen Share to others it sounds more like a NAT issue with (or possibly ports for Sharing Screens at your Grandma's) between you and your Buddy. ANd I think it is unlikely to be your ISP.
The Screen sharing part of iChat does not use the listed A/V or login ports.
It is supposed to use the Apple Remote Desktop ports that it is based on. However I have used Little Snitch which has pointed to many other Ports almost at random.
Try changing the Login port at both your End and your Grandma's
(iChat > Preferences > Accounts > Server settings tab - change the port from 5190 to 443) You can only do this whilst logged out of the AIM servers.
5:25 PM Tuesday; February 12, 2008

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Problem Screen Sharing with my grandma.

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