Hello, Mark. I continue testing the 1.21 version. The default installation seems to work; however, it does not support formula typing, nor references nor the short url. I see neither "short URL" nor MathJax" among the "extensions" you syggest; so, I insgtall again. This time, I choose all the extensions offered. I Expected that some of them provide the required options. The extensions seem to conflict; I get message [6ea7a99f] 2013-04-06 14:22:46: Fatal exception of type MWException Sincerely, Dima.