Problems sharing internet connection over airport

Hi everyone-
I've researched the heck out of the forums and still cant figure out what's happening with my system. I've got a MacBook Pro with OS 10.5.2. In previous OS versions (10.4) when I was successfully sharing my ethernet internet connection, the airport icon in the status bar showed a vertical "up" arrow, indicating that my connection was being shared.
I'm trying to do the same thing in OS 10.5.2 but not succeeding in getting the same notification. I'm finding that when I access the "Sharing" folder under "System Preferences" and select "Share your internet connection from: ethernet" and "To computers using: Airport" that both settings grey out, the "Internet Sharing" button turns green and the status says "On", but no sharing occurs. I've checked using other wireless laptops and a wifi finder, but no signal from my MacBook is ever found.
I've deleted my preferences folder to start fresh, no help. I've tried sharing from different ethernet sources, no help. It just feels like the problem is in the OS somewhere, not with the internet connection.
Any insight or help would be greatly appreciated! Thanks!

seems like i got the same issue as u and i just posted it:
http://discussions.apple.com/thread.jspa?threadID=1425809

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