something changed in 3.3 where if I resize my browser window when in the add-post admin area, the sidebar collides with the editor:
screenshot:
http://awesomescreenshot.com/080mkkcf5
**Another related issue:
I know that wp was working on making a fluid admin for 3.3-3.4.
The editor currently does not 'squish' properly. This is very evident when calling the wp_editor() on the front end of a website.
My website theme is fluid using media queries on the front-end, and I use the wp_editor() on the front as well. when I shrink the browswer width to <480px the editor does not continue to 'squish'.
screenshot: (wp_editor on front end of a fluid website theme)
http://awesomescreenshot.com/082mkko62
bottom line:
the wp_editor is currently not 'fluid' below a certain width, thus causing fluid templates to 'break'.