skype 2.2 cannot sign in but Skype 2.0 can

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http://askubuntu.com – I'm using Ubuntu 10.10, Skype 2.2 (beta) was installed and working perfectly then two days ago can't sign in any more !! it says: "Server connect failed" or "P2P connection failed" . I tried to re-install it but with previous version (2.0) then it can sign in correctly ! . What may cause this problem ?? and is 2.0 version stable enough for usage ?? there is no bugs ? Any suggestion will be appreciated :) . (HowTos)