Fraught with danger. Thankfully, there are some good resources on migrating to the new release. None completely documents all changes, but then, there are a ton of changes in 1.2. Conversion from 1.11 to 1.2 Upgrading to MooTools 1.2 - Tips, Tricks, and Backwards Compatibility MooTools upgrade: From 1.1 to 1.2 digitarald’s all important MooTools 1.1 To 1.2 - Classes is a must read if you’ve been w