Posted: 2009-04-15 10:17
I wonder if you try to convert a very long text by chance? The text is passed to the server as part of the URL and there are certain limitations as to the length of URLs, so it might fail for longer texts (anything over 256 characters).
If so, please check if it works with a shorter text or just a single word. If it also fails with shorter texts, please let me know. It'd also be helpful to know which browser (Internet Explorer, Firefox..) you're using, or if the problem persists after changing the browser etc.