Can't use Back to my Mac on OS X Lion

Hi,
I have upgraded both my MacBook Pro and iMac 27" to OS X Lion, and set up everything as suggested for the iCloud, but I still can't use Back to my Mac function.  In fact, on the macbook pro, I can't even see the shared sidebar (after trying several suggestions from the communities from 2008).  And on the iMac, I can see the shared sidebar, but there is no option for Back to my Mac.  I sware I've ticked Back to my Mac on the Finder's preferences, and everything apparent from the iCloud.
It'd be great if someone can point me to the right direction.  Thanks!
Cheers,

Carolyn,
After clicking your link, I think the solution described therein may work -- however, I brought my MBP to the Genius Bar and gave it to them the next 24-48 hours so they could run diagnostic tests, so I am not able to experiment with your solution.  I will say this, though: while I was still trying to fix it myself, I DID get the "Allow me to use my Apple ID to reset my account password" checkbox, which I checked, and on the next screen where it lists my various User Accounts (mine, and Guest), I clicked on mine, typed the password (and every conceivable other password I could possibly think of), but nothing worked.  Then, when it gave me my security question and gave me a link to "Reset my password," no other window popped up to allow me to perform the reset.
All in all, I'm fairly convinced this is a hardware issue, not a software issue.  My system recognizes my HD sometimes, but not others. Perhaps there is something wrong with the cable connecting the HD to the logic board.

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