We use Heroku to host Jawaya. Heroku uses Amazon Cloud services, which has been down for quite a while. If you've tried Jawaya today and it doesn't work, that's why.
It's also why you might see an error message when you visit sites, because the plugin checks Jawaya for each page you visit and search you perform.
Hopefully Amazon will be back up soon, but in the meantime I'm pushing Jawaya to another hosting provider that doesn't have the Amazon dependency.
Thanks for your patience!