Screen sharing greyed out - Airport Extreme

Hello all:
I'm trying to use screen sharing with another mac but my screen sharing option is greyed out. The setup is as follows:
- Computer 1 is a Quad Mac Pro, connected to an Airport Extreme (wireless).
- Computer 2 is a MacBook Pro (older one, but still plenty fast).
- Both computers are running iChat 4.0.7 and OSX 10.5.7
I can ask to share Computer 2's screen and am able to view/control their screen without a problem. The problem is I'm unable to share my screen at all (greyed out). I have scoured the web and this forum to see if I can find a solution, but so far no luck.
Here's what I've done so far:
1. Set Quicktime Streaming to 1.5Mbps on BOTH computers. Restarted iChat.
2. Connection Doctor/Capabilities shows green checks all the way down.
3. System Prefs/Security/Firewall: this is set to "access for specific services". In the list, File Sharing and Screen Sharing are both at top. I have also added the iChat application to the list just in case.
4. System Prefs/Sharing - File Sharing and Screen Sharing are both on.
5. iChat App: Screen Sharing is enabled here as well.
6. Both computers are using .MAC (or ME) accounts.
7. Have checked bandwith and both connections are plenty fast (20 down/8 up)
8. Airport Extreme on my end set to WPA2 Personal (could this be causing problems)?
I'm at my wit's end, not sure how to proceed. Anyone find a way to fix this? Again, i can screenshare Computer 2 just fine. It's Computer 1 (the faster of the two) that refuses to work.
Thanks for your help!

Hi,
From your end you can Offer to Share and Ask to Share (2 options)
The same is true of the Buddy (2 more options)
You only speak of this from one end.
Having said that In the Airport Base Station (Airport Utility) go to the Internet Icon pane and then the the NAT tab and set Port Mapping Protocol to be Enabled (there is no need to set ports)
10:32 PM Thursday; June 4, 2009
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