Facetime and iMessage not working after upgrade to Mountain Lion

Was running Messages (beta) and Facetime on my Macbook Pro with Lion.  I used both Facetime and sent iMessages through the Messages client, and they were both working 100%.
Today I upgraded from Lion (latest version) to Mountain Lion.  All is working except iMessages (through the Messages application) and Facetime.  When I try to log in, using the same @gmail.com account as I had done before, I get the message saying "The server encountered an error processing registration.  Please try again later".
I know that iMessage, with that account, is working.  I am using it from my iPhone and it works ok.  And I use the same account in iTunes, and it is ok there as well.
So what is wrong ?  What happened with iMessage and Facetime connectivity after the Mountain Lion upgrade ?

backup the device with itunes.
Restore the device with itunes and set up as new.
Sign into the facetime and imessage to activate it.
After that is done and activation is good.
Restore from the backup.
Then make sure to sign into facetime and imessage again and you should be good to go

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