Screen Sharing doesnt work on LAN

So I tried to screen share to my iMac yesterday and all that would come up on my MacBook is a small black screen. If I establish the connection manually by IP address with screen sharing it works fine but if I use the screen sharing button in the finder it doesn't work for me. I can go from my iMac to my MacBook and iBook G4 to MacBook. Have in mind its a fresh format computer all up to date. It did work after the reformat but for some reason its not wanting to work for me now. Im not running an admin account (I choose to not run as admin.) Now if I log into my admin account I can access my iMac on screen sharing and it works fine. So is there somewhere I need clear a cache or something to maybe fix this problem Anybody heard of this?

Same issue found I will try this when I get home
http://discussions.apple.com/thread.jspa?threadID=1730539&tstart=0

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