Screen sharing with G4 computer  Doesnt happen

Hi,
I have set up a connection between my Imac G5 and an G4 Quicksilver via ethernet connection in my office-I went through all the protocol for networking and can access the G4 but I cannot do a screen share. When I log on and and connect I can see everything with thin those limitations but when I click Screen share the window goes gray. I checked preferences and the screen share box is checked within the shared info folder...What am I missing? I believe I was able to before but havent connected in several months but now I can't do it!?
Any suggestions?

Check out the following KB Articles:
http://support.apple.com/kb/HT1109 Using and troubleshooting Back to My Mac in Mac OS X 10.5
http://support.apple.com/kb/HT2084 Mac OS X v10.5 and later: About Back to My Mac security
!http://i45.tinypic.com/jl0z95.jpg!

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