Sorry for the delay, have been busy getting things ready for a release. I checked your site, activated the Yoast plugin and the plugin is working flawlessly right now. See screenshot below –
https://docs.google.com/file/d/0B9j6FQo4cSQFMno1LTg4UXBMU1E/edit?usp=drivesdk
I am able to set the title, description, get the page analysed etc. The titles, descriptions etc. are taking effect too when the post is viewed. Was there any specific problem that you faced with this plugin? Pls try it out and see if things look better now. Thanks