Is it only happening in user CP? Like email page or profile pages? That was my issue, and its due to missing this:
Code:
{vb:raw headinclude_bottom}
In the affected templates (obviously vbulletin will have to fix their templates in an update).
Add that line above into any main page templates missing it, it should be above the closing head tag like so
Code:
{vb:raw headinclude_bottom}
</head>
<body>
It was missing in my USERCP_SHELL template, which affected all pages with the side navigation like the error you are getting in that screenshot.
EDIT: Sorry, in mine I added the product code to headinclude_bottom instead of headinclude, just check for {vb:raw headinclude} instead in those areas, if that doesn't work you have a conflict in your CSS somewhere (such as duplicate class/id names), or disabled javascript possibly