CJuiWidget registers jQuery-ui.min.js at body end.
In Yii 1.1.4,jquery.ui may being registered as a core scirpt that makes it renders at header by default.
So there may make to jquery-ui.min.js in page.
Modify zii.widgets.jui.CJuiWidget,line 120 as
// default unchanged,register as core script
if ('jquery-ui.min.js' === $this->scriptFile)
{
$cs->registerCoreScript('jquery.ui');
}
elseif(is_string($this->scriptFile))
from origin:
if(is_string($this->scriptFile))
this solves this problem