You probably have the MooTools Upgrade Plugin enabled. This is an optional plug-in that enables the MooTools 1.2 library on your site.
ChronoForms v3 (and many other Joomla! extensions) use the MooTools 1.1.2 library that is installed by default. The ChronoForms Wizard, and other back-end code will not run with the plugin enabled.
If you disable the plug-in then ChronoForms should run correctly.
If you need MooTools 1.2 in the front-end of your site then there is a hack for the plug-in posted in the forums here that will enable the 1.2 library in the front-end only. However the ChronoForms validation code and some other features will not work with this version.
There's a fuller "How-to Document" here that includes fixed files that will let the front-end of ChronoForms work with MooTools 1.2.
Bob
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