Cannot share screens, help please.

computers:
imac : 10.5.2, one gig memory, a second monitor is hooked up to the imac, router is dlink DI-524 (at different location...) the imac is brand new.
g5 dual 2.0 : 10.5.2 ghz, 2.5 gigs memory, linksys router wireless g broadband router with rangebooster
problem:
cannot share screens
at one time we had a problem video chatting. i opened the ports on the dlink according to apple's tech note or page about third party routers. (but we also replaced the mac with a new one.) anyway...
we can now video chat.
we can use ichat theater.
we cannot share screens
connection speeds for the imac are 3mbps down and 600kbps up
connection speeds for the g5 are 5mbps down and 330kbps up
the g5 has had no problem connecting to others, sharing screens
connection doctor reports no problems
connection doctor reports all features are available for the imac
connection doctor reports all features are available for the g5 except Backdrop Effects
what happens when we try to share screens:
we get a fail to connect message. but, for a second or two i can hear the other person, then the connection fails... i have seen the screen sharing starting message, but it would stop and fail. 3 seconds tops..
thanks,
g.

Screen Sharing is based on Apple Remote Desktop
Try opening port 5900 and 5988 (both TCP)
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