cannot drag and drop widgets since wordpress 3.2.1

I recently updated my site to wordpress 3.2.1 automatically.

Now I tried to manage my sidebar widgets, and noticed I can no longer drag and drop the widgets around. If I look into my browser-console, I notice that the page is unable to load jQuery. Weird: it appends my root-url to the jquery-url, like so:

<script type="text/javascript" src="http://meanderend.dixis.com//ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js?ver=3.2.1"></script>

So it is normal that it is not found. How can I
fix this. Is there something wrong in my configuration? Or is this a bug? Then it should be general, for everybody, no?

Your theme may be written badly and replace the correct jQuery. Switch to TwentyEleven to check for this. If this doesn’t help, turn off all plugins and re-enable them step by step.