I have the exact same issue as Lars Kristian Høydal who posted about 6 hrs ago as well as dylanvanderheij who can be found inside Lars Kristian's post.
here is the problem:
the popup boxes, like inserting media to posts/pages, is no longer visible. Instead I get a semi translucent grey screen and then no popup box appears for me to insert my image(s) into.
dylanvanderheij's link shows what happens on my site as well
I have tried all the troubleshooting from the master list 3.3
loading WP 3.3 manually by FTP
The theme I'm using is WPZoom's Videozoom 2.4
I would welcome any comments and suggestions.