Screen sharing stopped working this week
I found my answer to this crisis this week, but it was in the iCloud forum, where I never would've actually looked... so if on August 2nd your mac's ability to screen-share suddenly stopped -- you were able to connect to your other macs, even access their hard drives, but you'd hang up on the "Connecting...." dialog -- here's the problem & the fix:
1) you are an old MobileMe customer! Go into System Prefs>MobileMe
2) click "Sign Out" & make sure you are signed out before closing System Prefs.
3) Try Screen Share again. Bingo, you're in.
I have no idea why this MobileMe signin affected my ability to share screens locally, but thanks to another brilliant user in the iCloud forum who figured this out, we now know the culprit!
Best,
Kirby