I posted this in the Install It! Forum, but after searching the forum I suspect that perhaps this is a better place for it. After upgrading a portal from 3.0 to DNN3.3.4, I am getting a

'dnn.controls is null or not an object'

error (in the bottom left corner of the browser window, which is IE6 by the way) but only when logging in as host. The "direct-edit" functionality for modules does not work, either.

I have done an upgrade on another portal before this one and everything works as it should, so I suspected problems/incompatibility with the skin, but something tells me that this isn't it.

Looking at the source code of the page, the error seems to be caused by the following lines (there is a bunch similar to this):

<script>dnn.controls.initLabelEdit(dnn.dom.getById('dnn_ctr365_dnnTITLE_lblTitle'));</script>

As you can tell probably from my post I am a totally casual user of DNN and have zero knowledge about the inner workings. Any hints as to what might be causing this problem are appreciated!