Installed plugin and added UA code. Virtuemart tracking is enabled. Enabled the plugin and then tested the site.

Site loads and then disappears and hangs on google-analytics contact as it is trying (as it seems) to reload itself.

When the plugin is disabled, everything loads fine again.

Also tested in Internet Explorer which throws an error which references MooTools being unable to load.

Site uses RocketTheme template "Mynxx" which includes a VirtueMart backend. MooTools is used throughout the site for various module functionality.

Changed the "position" of the load in the drop down to last. Retested with the same effect in both Firefox and IE.