In early August a Skype v6.19 update came out that broke support for OS X 10.5.8, and a couple of weeks later Skype stopped accepting connections from old version of Skype. On August 27th, Skype quietly re-released v6.19, and it now supports OS X 10.5.8 again… http://www.skype.com/en/download-skype/skype-for-computer/