The portable computer is 10.7. The desktop is 10.8
I don't know if this will work, but you might give it a try:
Go into Keychain Access and find the entry for your mac on Back To My Mac (see here: http://support.apple.com/kb/HT4907) and delete it.
When you log in again, if it offers to remember the password, don't check the box.
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