Can't videochat with iMac Core Duo, can with PowerBook G4

Hi everyone. My girlfriend and I live in different time zones, so we've been using iChat (me) and AIM 5.9 (her) for the last year to videochat. My PowerBook's screen died recently, so I bought an iMac Core Duo, and all of a sudden, we can't connect anymore. Here's my setup:
20" iMac Core Duo:
Mac OS X 10.4.5, iChat AV 3.1.4
Connects using wireless
No firewall
17" PowerBook G4 1GHz:
Mac OS X 10.4.5, iChat AV (whichever version comes with 10.4.5 for PPC)
Connects using wireless
No firewall
AirPort Express:
Firmware 6.3 (tested with 6.1.1 as well)
NAT, no port forwarding
Whenever I attempt to videochat with my girlfriend using the iMac, I get an error stating "Prachi Gauriar[me] did not respond." I browsed the discussion boards here and found the testing screen names (thanks Ralph!).
With the iMac, I can connect to Mac users, including appleu3test01, appleu3test02, and friends of mine. I cannot connect to RjinWI PC via AirPort Express (same error as above). It does work when I connect my machine directly to my cable modem.
With the PowerBook, I can connect to both Mac users and RjinWI PC via AirPort Express.
Bottom line: Using the exact same setup on my PowerBook and iMac, the PowerBook works and the iMac doesn't. I suspect this has to do with the new AirPort Extreme cards that are being used in the iMacs, but I'm not sure.
Has anyone worked around this? I'm kind of avoiding setting up port forwarding on the AirPort Express, as it's troublesome and doesn't really seem to be the problem. I'm willing to do it, but I guess I just don't expect it to work, so I'm hoping someone else has another suggestion.
20" iMac Core Duo (Early 2006)   Mac OS X (10.4.5)  

Hi Rj,
It seems many people are forgetting the tweaks they made to get ichat 3 to work on Tiger on Non intels when they switch.
I would check System preferences > Quicktime and set the Streaming speed to match their download.
Next I would be concerned about iChat Add-ons that are written for PCC (non Intel) code and set iChat to Open With Rosetta in the File menu and re-start iChat
iChatUSBCam is not ready yet.
iGlasses is.
Showmacster seems it is not.
Lastly I would ask how the ports are opened for iChat in the Modem (or Router) IF Port Forwarding are they pointing to the old Mac ?
12:20 AM Monday; April 3, 2006

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